Merge branch 'ds/mark-parents-uninteresting-optim' into next
authorJunio C Hamano <gitster@pobox.com>
Fri, 2 Mar 2018 20:18:27 +0000 (12:18 -0800)
committerJunio C Hamano <gitster@pobox.com>
Fri, 2 Mar 2018 20:18:27 +0000 (12:18 -0800)
Micro optimization in revision traversal code.

* ds/mark-parents-uninteresting-optim:
revision.c: reduce object database queries

1  2 
revision.c
diff --combined revision.c
index 5c1cb7277c2fef11c473fbb3f6a9c04e0d83ca70,29f82ccfe651ab123b5ca2b6074a39f2ef9e047c..b42c836d7a64a67779c587954bcab90d919aaffb
@@@ -19,9 -19,6 +19,9 @@@
  #include "dir.h"
  #include "cache-tree.h"
  #include "bisect.h"
 +#include "packfile.h"
 +#include "worktree.h"
 +#include "argv-array.h"
  
  volatile show_early_output_fn_t show_early_output;
  
@@@ -62,10 -59,10 +62,10 @@@ static void mark_tree_contents_unintere
        while (tree_entry(&desc, &entry)) {
                switch (object_type(entry.mode)) {
                case OBJ_TREE:
 -                      mark_tree_uninteresting(lookup_tree(entry.oid->hash));
 +                      mark_tree_uninteresting(lookup_tree(entry.oid));
                        break;
                case OBJ_BLOB:
 -                      mark_blob_uninteresting(lookup_blob(entry.oid->hash));
 +                      mark_blob_uninteresting(lookup_blob(entry.oid));
                        break;
                default:
                        /* Subproject commit - not in this repository */
@@@ -113,7 -110,8 +113,8 @@@ void mark_parents_uninteresting(struct 
                         * it is popped next time around, we won't be trying
                         * to parse it and get an error.
                         */
-                       if (!has_object_file(&commit->object.oid))
+                       if (!commit->object.parsed &&
+                           !has_object_file(&commit->object.oid))
                                commit->object.parsed = 1;
  
                        if (commit->object.flags & UNINTERESTING)
@@@ -151,14 -149,16 +152,14 @@@ static void add_pending_object_with_pat
        if (revs->reflog_info && obj->type == OBJ_COMMIT) {
                struct strbuf buf = STRBUF_INIT;
                int len = interpret_branch_name(name, 0, &buf, 0);
 -              int st;
  
                if (0 < len && name[len] && buf.len)
                        strbuf_addstr(&buf, name + len);
 -              st = add_reflog_for_walk(revs->reflog_info,
 -                                       (struct commit *)obj,
 -                                       buf.buf[0] ? buf.buf: name);
 +              add_reflog_for_walk(revs->reflog_info,
 +                                  (struct commit *)obj,
 +                                  buf.buf[0] ? buf.buf: name);
                strbuf_release(&buf);
 -              if (st)
 -                      return;
 +              return; /* do not add the commit itself */
        }
        add_object_array_with_path(obj, name, &revs->pending, mode, path);
  }
@@@ -178,38 -178,36 +179,38 @@@ void add_pending_object(struct rev_inf
  
  void add_head_to_pending(struct rev_info *revs)
  {
 -      unsigned char sha1[20];
 +      struct object_id oid;
        struct object *obj;
 -      if (get_sha1("HEAD", sha1))
 +      if (get_oid("HEAD", &oid))
                return;
 -      obj = parse_object(sha1);
 +      obj = parse_object(&oid);
        if (!obj)
                return;
        add_pending_object(revs, obj, "HEAD");
  }
  
  static struct object *get_reference(struct rev_info *revs, const char *name,
 -                                  const unsigned char *sha1,
 +                                  const struct object_id *oid,
                                    unsigned int flags)
  {
        struct object *object;
  
 -      object = parse_object(sha1);
 +      object = parse_object(oid);
        if (!object) {
                if (revs->ignore_missing)
                        return object;
 +              if (revs->exclude_promisor_objects && is_promisor_object(oid))
 +                      return NULL;
                die("bad object %s", name);
        }
        object->flags |= flags;
        return object;
  }
  
 -void add_pending_sha1(struct rev_info *revs, const char *name,
 -                    const unsigned char *sha1, unsigned int flags)
 +void add_pending_oid(struct rev_info *revs, const char *name,
 +                    const struct object_id *oid, unsigned int flags)
  {
 -      struct object *object = get_reference(revs, name, sha1, flags);
 +      struct object *object = get_reference(revs, name, oid, flags);
        add_pending_object(revs, object, name);
  }
  
@@@ -231,9 -229,9 +232,9 @@@ static struct commit *handle_commit(str
                        add_pending_object(revs, object, tag->tag);
                if (!tag->tagged)
                        die("bad tag");
 -              object = parse_object(tag->tagged->oid.hash);
 +              object = parse_object(&tag->tagged->oid);
                if (!object) {
 -                      if (flags & UNINTERESTING)
 +                      if (revs->ignore_missing_links || (flags & UNINTERESTING))
                                return NULL;
                        die("bad object %s", oid_to_hex(&tag->tagged->oid));
                }
@@@ -397,43 -395,34 +398,43 @@@ static struct commit *one_relevant_pare
   * if the whole diff is removal of old data, and otherwise
   * REV_TREE_DIFFERENT (of course if the trees are the same we
   * want REV_TREE_SAME).
 - * That means that once we get to REV_TREE_DIFFERENT, we do not
 - * have to look any further.
 + *
 + * The only time we care about the distinction is when
 + * remove_empty_trees is in effect, in which case we care only about
 + * whether the whole change is REV_TREE_NEW, or if there's another type
 + * of change. Which means we can stop the diff early in either of these
 + * cases:
 + *
 + *   1. We're not using remove_empty_trees at all.
 + *
 + *   2. We saw anything except REV_TREE_NEW.
   */
  static int tree_difference = REV_TREE_SAME;
  
  static void file_add_remove(struct diff_options *options,
                    int addremove, unsigned mode,
 -                  const unsigned char *sha1,
 -                  int sha1_valid,
 +                  const struct object_id *oid,
 +                  int oid_valid,
                    const char *fullpath, unsigned dirty_submodule)
  {
        int diff = addremove == '+' ? REV_TREE_NEW : REV_TREE_OLD;
 +      struct rev_info *revs = options->change_fn_data;
  
        tree_difference |= diff;
 -      if (tree_difference == REV_TREE_DIFFERENT)
 -              DIFF_OPT_SET(options, HAS_CHANGES);
 +      if (!revs->remove_empty_trees || tree_difference != REV_TREE_NEW)
 +              options->flags.has_changes = 1;
  }
  
  static void file_change(struct diff_options *options,
                 unsigned old_mode, unsigned new_mode,
 -               const unsigned char *old_sha1,
 -               const unsigned char *new_sha1,
 -               int old_sha1_valid, int new_sha1_valid,
 +               const struct object_id *old_oid,
 +               const struct object_id *new_oid,
 +               int old_oid_valid, int new_oid_valid,
                 const char *fullpath,
                 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
  {
        tree_difference = REV_TREE_DIFFERENT;
 -      DIFF_OPT_SET(options, HAS_CHANGES);
 +      options->flags.has_changes = 1;
  }
  
  static int rev_compare_tree(struct rev_info *revs,
        }
  
        tree_difference = REV_TREE_SAME;
 -      DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
 -      if (diff_tree_sha1(t1->object.oid.hash, t2->object.oid.hash, "",
 +      revs->pruning.flags.has_changes = 0;
 +      if (diff_tree_oid(&t1->object.oid, &t2->object.oid, "",
                           &revs->pruning) < 0)
                return REV_TREE_DIFFERENT;
        return tree_difference;
@@@ -482,8 -471,8 +483,8 @@@ static int rev_same_tree_as_empty(struc
                return 0;
  
        tree_difference = REV_TREE_SAME;
 -      DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
 -      retval = diff_tree_sha1(NULL, t1->object.oid.hash, "", &revs->pruning);
 +      revs->pruning.flags.has_changes = 0;
 +      retval = diff_tree_oid(NULL, &t1->object.oid, "", &revs->pruning);
  
        return retval >= 0 && (tree_difference == REV_TREE_SAME);
  }
@@@ -801,17 -790,9 +802,17 @@@ static int add_parents_to_list(struct r
  
        for (parent = commit->parents; parent; parent = parent->next) {
                struct commit *p = parent->item;
 -
 -              if (parse_commit_gently(p, revs->ignore_missing_links) < 0)
 +              int gently = revs->ignore_missing_links ||
 +                           revs->exclude_promisor_objects;
 +              if (parse_commit_gently(p, gently) < 0) {
 +                      if (revs->exclude_promisor_objects &&
 +                          is_promisor_object(&p->object.oid)) {
 +                              if (revs->first_parent_only)
 +                                      break;
 +                              continue;
 +                      }
                        return -1;
 +              }
                if (revs->show_source && !p->util)
                        p->util = commit->util;
                p->object.flags |= left_flag;
@@@ -904,7 -885,7 +905,7 @@@ static void cherry_pick_list(struct com
  /* How many extra uninteresting commits we want to see.. */
  #define SLOP 5
  
 -static int still_interesting(struct commit_list *src, unsigned long date, int slop,
 +static int still_interesting(struct commit_list *src, timestamp_t date, int slop,
                             struct commit **interesting_cache)
  {
        /*
@@@ -1038,7 -1019,7 +1039,7 @@@ static void limit_left_right(struct com
  static int limit_list(struct rev_info *revs)
  {
        int slop = SLOP;
 -      unsigned long date = ~0ul;
 +      timestamp_t date = TIME_MAX;
        struct commit_list *list = revs->commits;
        struct commit_list *newlist = NULL;
        struct commit_list **p = &newlist;
                        return -1;
                if (obj->flags & UNINTERESTING) {
                        mark_parents_uninteresting(commit);
 -                      if (revs->show_all)
 -                              p = &commit_list_insert(commit, p)->next;
                        slop = still_interesting(list, date, slop, &interesting_cache);
                        if (slop)
                                continue;
 -                      /* If showing all, add the whole pending list to the end */
 -                      if (revs->show_all)
 -                              *p = list;
                        break;
                }
                if (revs->min_age != -1 && (commit->date > revs->min_age))
@@@ -1120,7 -1106,7 +1121,7 @@@ static void add_rev_cmdline(struct rev_
                            unsigned flags)
  {
        struct rev_cmdline_info *info = &revs->cmdline;
 -      int nr = info->nr;
 +      unsigned int nr = info->nr;
  
        ALLOC_GROW(info->rev, nr + 1, info->alloc);
        info->rev[nr].item = item;
@@@ -1148,7 -1134,6 +1149,7 @@@ struct all_refs_cb 
        int warned_bad_reflog;
        struct rev_info *all_revs;
        const char *name_for_errormsg;
 +      struct ref_store *refs;
  };
  
  int ref_excluded(struct string_list *ref_excludes, const char *path)
        if (!ref_excludes)
                return 0;
        for_each_string_list_item(item, ref_excludes) {
 -              if (!wildmatch(item->string, path, 0, NULL))
 +              if (!wildmatch(item->string, path, 0))
                        return 1;
        }
        return 0;
@@@ -1173,9 -1158,9 +1174,9 @@@ static int handle_one_ref(const char *p
        if (ref_excluded(cb->all_revs->ref_excludes, path))
            return 0;
  
 -      object = get_reference(cb->all_revs, path, oid->hash, cb->all_flags);
 +      object = get_reference(cb->all_revs, path, oid, cb->all_flags);
        add_rev_cmdline(cb->all_revs, object, path, REV_CMD_REF, cb->all_flags);
 -      add_pending_sha1(cb->all_revs, path, oid->hash, cb->all_flags);
 +      add_pending_oid(cb->all_revs, path, oid, cb->all_flags);
        return 0;
  }
  
@@@ -1184,8 -1169,6 +1185,8 @@@ static void init_all_refs_cb(struct all
  {
        cb->all_revs = revs;
        cb->all_flags = flags;
 +      revs->rev_input_given = 1;
 +      cb->refs = NULL;
  }
  
  void clear_ref_exclusion(struct string_list **ref_excludes_p)
@@@ -1206,26 -1189,19 +1207,26 @@@ void add_ref_exclusion(struct string_li
        string_list_append(*ref_excludes_p, exclude);
  }
  
 -static void handle_refs(const char *submodule, struct rev_info *revs, unsigned flags,
 -              int (*for_each)(const char *, each_ref_fn, void *))
 +static void handle_refs(struct ref_store *refs,
 +                      struct rev_info *revs, unsigned flags,
 +                      int (*for_each)(struct ref_store *, each_ref_fn, void *))
  {
        struct all_refs_cb cb;
 +
 +      if (!refs) {
 +              /* this could happen with uninitialized submodules */
 +              return;
 +      }
 +
        init_all_refs_cb(&cb, revs, flags);
 -      for_each(submodule, handle_one_ref, &cb);
 +      for_each(refs, handle_one_ref, &cb);
  }
  
 -static void handle_one_reflog_commit(unsigned char *sha1, void *cb_data)
 +static void handle_one_reflog_commit(struct object_id *oid, void *cb_data)
  {
        struct all_refs_cb *cb = cb_data;
 -      if (!is_null_sha1(sha1)) {
 -              struct object *o = parse_object(sha1);
 +      if (!is_null_oid(oid)) {
 +              struct object *o = parse_object(oid);
                if (o) {
                        o->flags |= cb->all_flags;
                        /* ??? CMDLINEFLAGS ??? */
        }
  }
  
 -static int handle_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 -              const char *email, unsigned long timestamp, int tz,
 +static int handle_one_reflog_ent(struct object_id *ooid, struct object_id *noid,
 +              const char *email, timestamp_t timestamp, int tz,
                const char *message, void *cb_data)
  {
 -      handle_one_reflog_commit(osha1, cb_data);
 -      handle_one_reflog_commit(nsha1, cb_data);
 +      handle_one_reflog_commit(ooid, cb_data);
 +      handle_one_reflog_commit(noid, cb_data);
        return 0;
  }
  
@@@ -1254,41 -1230,17 +1255,41 @@@ static int handle_one_reflog(const cha
        struct all_refs_cb *cb = cb_data;
        cb->warned_bad_reflog = 0;
        cb->name_for_errormsg = path;
 -      for_each_reflog_ent(path, handle_one_reflog_ent, cb_data);
 +      refs_for_each_reflog_ent(cb->refs, path,
 +                               handle_one_reflog_ent, cb_data);
        return 0;
  }
  
 +static void add_other_reflogs_to_pending(struct all_refs_cb *cb)
 +{
 +      struct worktree **worktrees, **p;
 +
 +      worktrees = get_worktrees(0);
 +      for (p = worktrees; *p; p++) {
 +              struct worktree *wt = *p;
 +
 +              if (wt->is_current)
 +                      continue;
 +
 +              cb->refs = get_worktree_ref_store(wt);
 +              refs_for_each_reflog(cb->refs,
 +                                   handle_one_reflog,
 +                                   cb);
 +      }
 +      free_worktrees(worktrees);
 +}
 +
  void add_reflogs_to_pending(struct rev_info *revs, unsigned flags)
  {
        struct all_refs_cb cb;
  
        cb.all_revs = revs;
        cb.all_flags = flags;
 +      cb.refs = get_main_ref_store();
        for_each_reflog(handle_one_reflog, &cb);
 +
 +      if (!revs->single_worktree)
 +              add_other_reflogs_to_pending(&cb);
  }
  
  static void add_cache_tree(struct cache_tree *it, struct rev_info *revs,
        int i;
  
        if (it->entry_count >= 0) {
 -              struct tree *tree = lookup_tree(it->sha1);
 +              struct tree *tree = lookup_tree(&it->oid);
                add_pending_object_with_path(revs, &tree->object, "",
                                             040000, path->buf);
        }
  
  }
  
 -void add_index_objects_to_pending(struct rev_info *revs, unsigned flags)
 +static void do_add_index_objects_to_pending(struct rev_info *revs,
 +                                          struct index_state *istate)
  {
        int i;
  
 -      read_cache();
 -      for (i = 0; i < active_nr; i++) {
 -              struct cache_entry *ce = active_cache[i];
 +      for (i = 0; i < istate->cache_nr; i++) {
 +              struct cache_entry *ce = istate->cache[i];
                struct blob *blob;
  
                if (S_ISGITLINK(ce->ce_mode))
                        continue;
  
 -              blob = lookup_blob(ce->oid.hash);
 +              blob = lookup_blob(&ce->oid);
                if (!blob)
                        die("unable to add index blob to traversal");
                add_pending_object_with_path(revs, &blob->object, "",
                                             ce->ce_mode, ce->name);
        }
  
 -      if (active_cache_tree) {
 +      if (istate->cache_tree) {
                struct strbuf path = STRBUF_INIT;
 -              add_cache_tree(active_cache_tree, revs, &path);
 +              add_cache_tree(istate->cache_tree, revs, &path);
                strbuf_release(&path);
        }
  }
  
 +void add_index_objects_to_pending(struct rev_info *revs, unsigned int flags)
 +{
 +      struct worktree **worktrees, **p;
 +
 +      read_cache();
 +      do_add_index_objects_to_pending(revs, &the_index);
 +
 +      if (revs->single_worktree)
 +              return;
 +
 +      worktrees = get_worktrees(0);
 +      for (p = worktrees; *p; p++) {
 +              struct worktree *wt = *p;
 +              struct index_state istate = { NULL };
 +
 +              if (wt->is_current)
 +                      continue; /* current index already taken care of */
 +
 +              if (read_index_from(&istate,
 +                                  worktree_git_path(wt, "index"),
 +                                  get_worktree_git_dir(wt)) > 0)
 +                      do_add_index_objects_to_pending(revs, &istate);
 +              discard_index(&istate);
 +      }
 +      free_worktrees(worktrees);
 +}
 +
  static int add_parents_only(struct rev_info *revs, const char *arg_, int flags,
                            int exclude_parent)
  {
 -      unsigned char sha1[20];
 +      struct object_id oid;
        struct object *it;
        struct commit *commit;
        struct commit_list *parents;
                flags ^= UNINTERESTING | BOTTOM;
                arg++;
        }
 -      if (get_sha1_committish(arg, sha1))
 +      if (get_oid_committish(arg, &oid))
                return 0;
        while (1) {
 -              it = get_reference(revs, arg, sha1, 0);
 +              it = get_reference(revs, arg, &oid, 0);
                if (!it && revs->ignore_missing)
                        return 0;
                if (it->type != OBJ_TAG)
                        break;
                if (!((struct tag*)it)->tagged)
                        return 0;
 -              hashcpy(sha1, ((struct tag*)it)->tagged->oid.hash);
 +              oidcpy(&oid, &((struct tag*)it)->tagged->oid);
        }
        if (it->type != OBJ_COMMIT)
                return 0;
@@@ -1418,11 -1343,10 +1419,11 @@@ void init_revisions(struct rev_info *re
        revs->abbrev = DEFAULT_ABBREV;
        revs->ignore_merges = 1;
        revs->simplify_history = 1;
 -      DIFF_OPT_SET(&revs->pruning, RECURSIVE);
 -      DIFF_OPT_SET(&revs->pruning, QUICK);
 +      revs->pruning.flags.recursive = 1;
 +      revs->pruning.flags.quick = 1;
        revs->pruning.add_remove = file_add_remove;
        revs->pruning.change = file_change;
 +      revs->pruning.change_fn_data = revs;
        revs->sort_order = REV_SORT_IN_GRAPH_ORDER;
        revs->dense = 1;
        revs->prefix = prefix;
        init_grep_defaults();
        grep_init(&revs->grep_filter, prefix);
        revs->grep_filter.status_only = 1;
 -      revs->grep_filter.regflags = REG_NEWLINE;
  
        diff_setup(&revs->diffopt);
        if (prefix && !revs->diffopt.prefix) {
@@@ -1465,16 -1390,16 +1466,16 @@@ static void prepare_show_merge(struct r
  {
        struct commit_list *bases;
        struct commit *head, *other;
 -      unsigned char sha1[20];
 +      struct object_id oid;
        const char **prune = NULL;
        int i, prune_num = 1; /* counting terminating NULL */
  
 -      if (get_sha1("HEAD", sha1))
 +      if (get_oid("HEAD", &oid))
                die("--merge without HEAD?");
 -      head = lookup_commit_or_die(sha1, "HEAD");
 -      if (get_sha1("MERGE_HEAD", sha1))
 +      head = lookup_commit_or_die(&oid, "HEAD");
 +      if (get_oid("MERGE_HEAD", &oid))
                die("--merge without MERGE_HEAD?");
 -      other = lookup_commit_or_die(sha1, "MERGE_HEAD");
 +      other = lookup_commit_or_die(&oid, "MERGE_HEAD");
        add_pending_object(revs, &head->object, "HEAD");
        add_pending_object(revs, &other->object, "MERGE_HEAD");
        bases = get_merge_bases(head, other);
        revs->limited = 1;
  }
  
 +static int dotdot_missing(const char *arg, char *dotdot,
 +                        struct rev_info *revs, int symmetric)
 +{
 +      if (revs->ignore_missing)
 +              return 0;
 +      /* de-munge so we report the full argument */
 +      *dotdot = '.';
 +      die(symmetric
 +          ? "Invalid symmetric difference expression %s"
 +          : "Invalid revision range %s", arg);
 +}
 +
 +static int handle_dotdot_1(const char *arg, char *dotdot,
 +                         struct rev_info *revs, int flags,
 +                         int cant_be_filename,
 +                         struct object_context *a_oc,
 +                         struct object_context *b_oc)
 +{
 +      const char *a_name, *b_name;
 +      struct object_id a_oid, b_oid;
 +      struct object *a_obj, *b_obj;
 +      unsigned int a_flags, b_flags;
 +      int symmetric = 0;
 +      unsigned int flags_exclude = flags ^ (UNINTERESTING | BOTTOM);
 +      unsigned int oc_flags = GET_OID_COMMITTISH | GET_OID_RECORD_PATH;
 +
 +      a_name = arg;
 +      if (!*a_name)
 +              a_name = "HEAD";
 +
 +      b_name = dotdot + 2;
 +      if (*b_name == '.') {
 +              symmetric = 1;
 +              b_name++;
 +      }
 +      if (!*b_name)
 +              b_name = "HEAD";
 +
 +      if (get_oid_with_context(a_name, oc_flags, &a_oid, a_oc) ||
 +          get_oid_with_context(b_name, oc_flags, &b_oid, b_oc))
 +              return -1;
 +
 +      if (!cant_be_filename) {
 +              *dotdot = '.';
 +              verify_non_filename(revs->prefix, arg);
 +              *dotdot = '\0';
 +      }
 +
 +      a_obj = parse_object(&a_oid);
 +      b_obj = parse_object(&b_oid);
 +      if (!a_obj || !b_obj)
 +              return dotdot_missing(arg, dotdot, revs, symmetric);
 +
 +      if (!symmetric) {
 +              /* just A..B */
 +              b_flags = flags;
 +              a_flags = flags_exclude;
 +      } else {
 +              /* A...B -- find merge bases between the two */
 +              struct commit *a, *b;
 +              struct commit_list *exclude;
 +
 +              a = lookup_commit_reference(&a_obj->oid);
 +              b = lookup_commit_reference(&b_obj->oid);
 +              if (!a || !b)
 +                      return dotdot_missing(arg, dotdot, revs, symmetric);
 +
 +              exclude = get_merge_bases(a, b);
 +              add_rev_cmdline_list(revs, exclude, REV_CMD_MERGE_BASE,
 +                                   flags_exclude);
 +              add_pending_commit_list(revs, exclude, flags_exclude);
 +              free_commit_list(exclude);
 +
 +              b_flags = flags;
 +              a_flags = flags | SYMMETRIC_LEFT;
 +      }
 +
 +      a_obj->flags |= a_flags;
 +      b_obj->flags |= b_flags;
 +      add_rev_cmdline(revs, a_obj, a_name, REV_CMD_LEFT, a_flags);
 +      add_rev_cmdline(revs, b_obj, b_name, REV_CMD_RIGHT, b_flags);
 +      add_pending_object_with_path(revs, a_obj, a_name, a_oc->mode, a_oc->path);
 +      add_pending_object_with_path(revs, b_obj, b_name, b_oc->mode, b_oc->path);
 +      return 0;
 +}
 +
 +static int handle_dotdot(const char *arg,
 +                       struct rev_info *revs, int flags,
 +                       int cant_be_filename)
 +{
 +      struct object_context a_oc, b_oc;
 +      char *dotdot = strstr(arg, "..");
 +      int ret;
 +
 +      if (!dotdot)
 +              return -1;
 +
 +      memset(&a_oc, 0, sizeof(a_oc));
 +      memset(&b_oc, 0, sizeof(b_oc));
 +
 +      *dotdot = '\0';
 +      ret = handle_dotdot_1(arg, dotdot, revs, flags, cant_be_filename,
 +                            &a_oc, &b_oc);
 +      *dotdot = '.';
 +
 +      free(a_oc.path);
 +      free(b_oc.path);
 +
 +      return ret;
 +}
 +
  int handle_revision_arg(const char *arg_, struct rev_info *revs, int flags, unsigned revarg_opt)
  {
        struct object_context oc;
 -      char *dotdot;
 +      char *mark;
        struct object *object;
 -      unsigned char sha1[20];
 +      struct object_id oid;
        int local_flags;
        const char *arg = arg_;
        int cant_be_filename = revarg_opt & REVARG_CANNOT_BE_FILENAME;
 -      unsigned get_sha1_flags = 0;
 +      unsigned get_sha1_flags = GET_OID_RECORD_PATH;
  
        flags = flags & UNINTERESTING ? flags | BOTTOM : flags & ~BOTTOM;
  
 -      dotdot = strstr(arg, "..");
 -      if (dotdot) {
 -              unsigned char from_sha1[20];
 -              const char *next = dotdot + 2;
 -              const char *this = arg;
 -              int symmetric = *next == '.';
 -              unsigned int flags_exclude = flags ^ (UNINTERESTING | BOTTOM);
 -              static const char head_by_default[] = "HEAD";
 -              unsigned int a_flags;
 -
 -              *dotdot = 0;
 -              next += symmetric;
 -
 -              if (!*next)
 -                      next = head_by_default;
 -              if (dotdot == arg)
 -                      this = head_by_default;
 -              if (this == head_by_default && next == head_by_default &&
 -                  !symmetric) {
 -                      /*
 -                       * Just ".."?  That is not a range but the
 -                       * pathspec for the parent directory.
 -                       */
 -                      if (!cant_be_filename) {
 -                              *dotdot = '.';
 -                              return -1;
 -                      }
 -              }
 -              if (!get_sha1_committish(this, from_sha1) &&
 -                  !get_sha1_committish(next, sha1)) {
 -                      struct object *a_obj, *b_obj;
 -
 -                      if (!cant_be_filename) {
 -                              *dotdot = '.';
 -                              verify_non_filename(revs->prefix, arg);
 -                      }
 -
 -                      a_obj = parse_object(from_sha1);
 -                      b_obj = parse_object(sha1);
 -                      if (!a_obj || !b_obj) {
 -                      missing:
 -                              if (revs->ignore_missing)
 -                                      return 0;
 -                              die(symmetric
 -                                  ? "Invalid symmetric difference expression %s"
 -                                  : "Invalid revision range %s", arg);
 -                      }
 -
 -                      if (!symmetric) {
 -                              /* just A..B */
 -                              a_flags = flags_exclude;
 -                      } else {
 -                              /* A...B -- find merge bases between the two */
 -                              struct commit *a, *b;
 -                              struct commit_list *exclude;
 -
 -                              a = (a_obj->type == OBJ_COMMIT
 -                                   ? (struct commit *)a_obj
 -                                   : lookup_commit_reference(a_obj->oid.hash));
 -                              b = (b_obj->type == OBJ_COMMIT
 -                                   ? (struct commit *)b_obj
 -                                   : lookup_commit_reference(b_obj->oid.hash));
 -                              if (!a || !b)
 -                                      goto missing;
 -                              exclude = get_merge_bases(a, b);
 -                              add_rev_cmdline_list(revs, exclude,
 -                                                   REV_CMD_MERGE_BASE,
 -                                                   flags_exclude);
 -                              add_pending_commit_list(revs, exclude,
 -                                                      flags_exclude);
 -                              free_commit_list(exclude);
 -
 -                              a_flags = flags | SYMMETRIC_LEFT;
 -                      }
 -
 -                      a_obj->flags |= a_flags;
 -                      b_obj->flags |= flags;
 -                      add_rev_cmdline(revs, a_obj, this,
 -                                      REV_CMD_LEFT, a_flags);
 -                      add_rev_cmdline(revs, b_obj, next,
 -                                      REV_CMD_RIGHT, flags);
 -                      add_pending_object(revs, a_obj, this);
 -                      add_pending_object(revs, b_obj, next);
 -                      return 0;
 -              }
 -              *dotdot = '.';
 +      if (!cant_be_filename && !strcmp(arg, "..")) {
 +              /*
 +               * Just ".."?  That is not a range but the
 +               * pathspec for the parent directory.
 +               */
 +              return -1;
        }
  
 -      dotdot = strstr(arg, "^@");
 -      if (dotdot && !dotdot[2]) {
 -              *dotdot = 0;
 +      if (!handle_dotdot(arg, revs, flags, revarg_opt))
 +              return 0;
 +
 +      mark = strstr(arg, "^@");
 +      if (mark && !mark[2]) {
 +              *mark = 0;
                if (add_parents_only(revs, arg, flags, 0))
                        return 0;
 -              *dotdot = '^';
 +              *mark = '^';
        }
 -      dotdot = strstr(arg, "^!");
 -      if (dotdot && !dotdot[2]) {
 -              *dotdot = 0;
 +      mark = strstr(arg, "^!");
 +      if (mark && !mark[2]) {
 +              *mark = 0;
                if (!add_parents_only(revs, arg, flags ^ (UNINTERESTING | BOTTOM), 0))
 -                      *dotdot = '^';
 +                      *mark = '^';
        }
 -      dotdot = strstr(arg, "^-");
 -      if (dotdot) {
 +      mark = strstr(arg, "^-");
 +      if (mark) {
                int exclude_parent = 1;
  
 -              if (dotdot[2]) {
 +              if (mark[2]) {
                        char *end;
 -                      exclude_parent = strtoul(dotdot + 2, &end, 10);
 +                      exclude_parent = strtoul(mark + 2, &end, 10);
                        if (*end != '\0' || !exclude_parent)
                                return -1;
                }
  
 -              *dotdot = 0;
 +              *mark = 0;
                if (!add_parents_only(revs, arg, flags ^ (UNINTERESTING | BOTTOM), exclude_parent))
 -                      *dotdot = '^';
 +                      *mark = '^';
        }
  
        local_flags = 0;
        }
  
        if (revarg_opt & REVARG_COMMITTISH)
 -              get_sha1_flags = GET_SHA1_COMMITTISH;
 +              get_sha1_flags |= GET_OID_COMMITTISH;
  
 -      if (get_sha1_with_context(arg, get_sha1_flags, sha1, &oc))
 +      if (get_oid_with_context(arg, get_sha1_flags, &oid, &oc))
                return revs->ignore_missing ? 0 : -1;
        if (!cant_be_filename)
                verify_non_filename(revs->prefix, arg);
 -      object = get_reference(revs, arg, sha1, flags ^ local_flags);
 +      object = get_reference(revs, arg, &oid, flags ^ local_flags);
        add_rev_cmdline(revs, object, arg_, REV_CMD_REV, flags ^ local_flags);
 -      add_pending_object_with_mode(revs, object, arg, oc.mode);
 +      add_pending_object_with_path(revs, object, arg, oc.mode, oc.path);
 +      free(oc.path);
        return 0;
  }
  
 -struct cmdline_pathspec {
 -      int alloc;
 -      int nr;
 -      const char **path;
 -};
 -
 -static void append_prune_data(struct cmdline_pathspec *prune, const char **av)
 -{
 -      while (*av) {
 -              ALLOC_GROW(prune->path, prune->nr + 1, prune->alloc);
 -              prune->path[prune->nr++] = *(av++);
 -      }
 -}
 -
  static void read_pathspec_from_stdin(struct rev_info *revs, struct strbuf *sb,
 -                                   struct cmdline_pathspec *prune)
 +                                   struct argv_array *prune)
  {
 -      while (strbuf_getline(sb, stdin) != EOF) {
 -              ALLOC_GROW(prune->path, prune->nr + 1, prune->alloc);
 -              prune->path[prune->nr++] = xstrdup(sb->buf);
 -      }
 +      while (strbuf_getline(sb, stdin) != EOF)
 +              argv_array_push(prune, sb->buf);
  }
  
  static void read_revisions_from_stdin(struct rev_info *revs,
 -                                    struct cmdline_pathspec *prune)
 +                                    struct argv_array *prune)
  {
        struct strbuf sb;
        int seen_dashdash = 0;
@@@ -1785,8 -1691,8 +1786,8 @@@ static int handle_revision_opt(struct r
                revs->max_count = atoi(argv[1]);
                revs->no_walk = 0;
                return 2;
 -      } else if (starts_with(arg, "-n")) {
 -              revs->max_count = atoi(arg + 2);
 +      } else if (skip_prefix(arg, "-n", &optarg)) {
 +              revs->max_count = atoi(optarg);
                revs->no_walk = 0;
        } else if ((argcount = parse_long_opt("max-age", argv, &optarg))) {
                revs->max_age = atoi(optarg);
                revs->simplify_by_decoration = 1;
                revs->limited = 1;
                revs->prune = 1;
 -              load_ref_decorations(DECORATE_SHORT_REFS);
 +              load_ref_decorations(NULL, DECORATE_SHORT_REFS);
        } else if (!strcmp(arg, "--date-order")) {
                revs->sort_order = REV_SORT_BY_COMMIT_DATE;
                revs->topo_order = 1;
        } else if (!strcmp(arg, "--author-date-order")) {
                revs->sort_order = REV_SORT_BY_AUTHOR_DATE;
                revs->topo_order = 1;
 -      } else if (starts_with(arg, "--early-output")) {
 -              int count = 100;
 -              switch (arg[14]) {
 -              case '=':
 -                      count = atoi(arg+15);
 -                      /* Fallthrough */
 -              case 0:
 -                      revs->topo_order = 1;
 -                     revs->early_output = count;
 -              }
 +      } else if (!strcmp(arg, "--early-output")) {
 +              revs->early_output = 100;
 +              revs->topo_order = 1;
 +      } else if (skip_prefix(arg, "--early-output=", &optarg)) {
 +              if (strtoul_ui(optarg, 10, &revs->early_output) < 0)
 +                      die("'%s': not a non-negative integer", optarg);
 +              revs->topo_order = 1;
        } else if (!strcmp(arg, "--parents")) {
                revs->rewrite_parents = 1;
                revs->print_parents = 1;
                revs->dense = 1;
        } else if (!strcmp(arg, "--sparse")) {
                revs->dense = 0;
 -      } else if (!strcmp(arg, "--show-all")) {
 -              revs->show_all = 1;
 +      } else if (!strcmp(arg, "--in-commit-order")) {
 +              revs->tree_blobs_in_commit_order = 1;
        } else if (!strcmp(arg, "--remove-empty")) {
                revs->remove_empty_trees = 1;
        } else if (!strcmp(arg, "--merges")) {
                revs->min_parents = 2;
        } else if (!strcmp(arg, "--no-merges")) {
                revs->max_parents = 1;
 -      } else if (starts_with(arg, "--min-parents=")) {
 -              revs->min_parents = atoi(arg+14);
 -      } else if (starts_with(arg, "--no-min-parents")) {
 +      } else if (skip_prefix(arg, "--min-parents=", &optarg)) {
 +              revs->min_parents = atoi(optarg);
 +      } else if (!strcmp(arg, "--no-min-parents")) {
                revs->min_parents = 0;
 -      } else if (starts_with(arg, "--max-parents=")) {
 -              revs->max_parents = atoi(arg+14);
 -      } else if (starts_with(arg, "--no-max-parents")) {
 +      } else if (skip_prefix(arg, "--max-parents=", &optarg)) {
 +              revs->max_parents = atoi(optarg);
 +      } else if (!strcmp(arg, "--no-max-parents")) {
                revs->max_parents = -1;
        } else if (!strcmp(arg, "--boundary")) {
                revs->boundary = 1;
                die("--unpacked=<packfile> no longer supported.");
        } else if (!strcmp(arg, "-r")) {
                revs->diff = 1;
 -              DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
 +              revs->diffopt.flags.recursive = 1;
        } else if (!strcmp(arg, "-t")) {
                revs->diff = 1;
 -              DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
 -              DIFF_OPT_SET(&revs->diffopt, TREE_IN_RECURSIVE);
 +              revs->diffopt.flags.recursive = 1;
 +              revs->diffopt.flags.tree_in_recursive = 1;
        } else if (!strcmp(arg, "-m")) {
                revs->ignore_merges = 0;
        } else if (!strcmp(arg, "-c")) {
                revs->verbose_header = 1;
                revs->pretty_given = 1;
                get_commit_format(NULL, revs);
 -      } else if (starts_with(arg, "--pretty=") || starts_with(arg, "--format=")) {
 +      } else if (skip_prefix(arg, "--pretty=", &optarg) ||
 +                 skip_prefix(arg, "--format=", &optarg)) {
                /*
                 * Detached form ("--pretty X" as opposed to "--pretty=X")
                 * not allowed, since the argument is optional.
                 */
                revs->verbose_header = 1;
                revs->pretty_given = 1;
 -              get_commit_format(arg+9, revs);
 +              get_commit_format(optarg, revs);
        } else if (!strcmp(arg, "--expand-tabs")) {
                revs->expand_tabs_in_log = 8;
        } else if (!strcmp(arg, "--no-expand-tabs")) {
                revs->show_signature = 1;
        } else if (!strcmp(arg, "--no-show-signature")) {
                revs->show_signature = 0;
 -      } else if (!strcmp(arg, "--show-linear-break") ||
 -                 starts_with(arg, "--show-linear-break=")) {
 -              if (starts_with(arg, "--show-linear-break="))
 -                      revs->break_bar = xstrdup(arg + 20);
 -              else
 -                      revs->break_bar = "                    ..........";
 +      } else if (!strcmp(arg, "--show-linear-break")) {
 +              revs->break_bar = "                    ..........";
 +              revs->track_linear = 1;
 +              revs->track_first_time = 1;
 +      } else if (skip_prefix(arg, "--show-linear-break=", &optarg)) {
 +              revs->break_bar = xstrdup(optarg);
                revs->track_linear = 1;
                revs->track_first_time = 1;
 -      } else if (starts_with(arg, "--show-notes=") ||
 -                 starts_with(arg, "--notes=")) {
 +      } else if (skip_prefix(arg, "--show-notes=", &optarg) ||
 +                 skip_prefix(arg, "--notes=", &optarg)) {
                struct strbuf buf = STRBUF_INIT;
                revs->show_notes = 1;
                revs->show_notes_given = 1;
 -              if (starts_with(arg, "--show-notes")) {
 -                      if (revs->notes_opt.use_default_notes < 0)
 -                              revs->notes_opt.use_default_notes = 1;
 -                      strbuf_addstr(&buf, arg+13);
 -              }
 -              else
 -                      strbuf_addstr(&buf, arg+8);
 +              if (starts_with(arg, "--show-notes=") &&
 +                  revs->notes_opt.use_default_notes < 0)
 +                      revs->notes_opt.use_default_notes = 1;
 +              strbuf_addstr(&buf, optarg);
                expand_notes_ref(&buf);
                string_list_append(&revs->notes_opt.extra_notes_refs,
                                   strbuf_detach(&buf, NULL));
                revs->abbrev = 0;
        } else if (!strcmp(arg, "--abbrev")) {
                revs->abbrev = DEFAULT_ABBREV;
 -      } else if (starts_with(arg, "--abbrev=")) {
 -              revs->abbrev = strtoul(arg + 9, NULL, 10);
 +      } else if (skip_prefix(arg, "--abbrev=", &optarg)) {
 +              revs->abbrev = strtoul(optarg, NULL, 10);
                if (revs->abbrev < MINIMUM_ABBREV)
                        revs->abbrev = MINIMUM_ABBREV;
                else if (revs->abbrev > 40)
        } else if (!strcmp(arg, "--extended-regexp") || !strcmp(arg, "-E")) {
                revs->grep_filter.pattern_type_option = GREP_PATTERN_TYPE_ERE;
        } else if (!strcmp(arg, "--regexp-ignore-case") || !strcmp(arg, "-i")) {
 -              revs->grep_filter.regflags |= REG_ICASE;
 -              DIFF_OPT_SET(&revs->diffopt, PICKAXE_IGNORE_CASE);
 +              revs->grep_filter.ignore_case = 1;
 +              revs->diffopt.pickaxe_opts |= DIFF_PICKAXE_IGNORE_CASE;
        } else if (!strcmp(arg, "--fixed-strings") || !strcmp(arg, "-F")) {
                revs->grep_filter.pattern_type_option = GREP_PATTERN_TYPE_FIXED;
 -      } else if (!strcmp(arg, "--perl-regexp")) {
 +      } else if (!strcmp(arg, "--perl-regexp") || !strcmp(arg, "-P")) {
                revs->grep_filter.pattern_type_option = GREP_PATTERN_TYPE_PCRE;
        } else if (!strcmp(arg, "--all-match")) {
                revs->grep_filter.all_match = 1;
                revs->limited = 1;
        } else if (!strcmp(arg, "--ignore-missing")) {
                revs->ignore_missing = 1;
 +      } else if (!strcmp(arg, "--exclude-promisor-objects")) {
 +              if (fetch_if_missing)
 +                      die("BUG: exclude_promisor_objects can only be used when fetch_if_missing is 0");
 +              revs->exclude_promisor_objects = 1;
        } else {
                int opts = diff_opt_parse(&revs->diffopt, argv, argc, revs->prefix);
                if (!opts)
@@@ -2134,25 -2041,23 +2135,25 @@@ void parse_revision_opt(struct rev_inf
        ctx->argc -= n;
  }
  
 -static int for_each_bisect_ref(const char *submodule, each_ref_fn fn, void *cb_data, const char *term) {
 +static int for_each_bisect_ref(struct ref_store *refs, each_ref_fn fn,
 +                             void *cb_data, const char *term)
 +{
        struct strbuf bisect_refs = STRBUF_INIT;
        int status;
        strbuf_addf(&bisect_refs, "refs/bisect/%s", term);
 -      status = for_each_ref_in_submodule(submodule, bisect_refs.buf, fn, cb_data);
 +      status = refs_for_each_fullref_in(refs, bisect_refs.buf, fn, cb_data, 0);
        strbuf_release(&bisect_refs);
        return status;
  }
  
 -static int for_each_bad_bisect_ref(const char *submodule, each_ref_fn fn, void *cb_data)
 +static int for_each_bad_bisect_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
  {
 -      return for_each_bisect_ref(submodule, fn, cb_data, term_bad);
 +      return for_each_bisect_ref(refs, fn, cb_data, term_bad);
  }
  
 -static int for_each_good_bisect_ref(const char *submodule, each_ref_fn fn, void *cb_data)
 +static int for_each_good_bisect_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
  {
 -      return for_each_bisect_ref(submodule, fn, cb_data, term_good);
 +      return for_each_bisect_ref(refs, fn, cb_data, term_good);
  }
  
  static int handle_revision_pseudo_opt(const char *submodule,
  {
        const char *arg = argv[0];
        const char *optarg;
 +      struct ref_store *refs;
        int argcount;
  
 +      if (submodule) {
 +              /*
 +               * We need some something like get_submodule_worktrees()
 +               * before we can go through all worktrees of a submodule,
 +               * .e.g with adding all HEADs from --all, which is not
 +               * supported right now, so stick to single worktree.
 +               */
 +              if (!revs->single_worktree)
 +                      die("BUG: --single-worktree cannot be used together with submodule");
 +              refs = get_submodule_ref_store(submodule);
 +      } else
 +              refs = get_main_ref_store();
 +
        /*
         * NOTE!
         *
         * register it in the list at the top of handle_revision_opt.
         */
        if (!strcmp(arg, "--all")) {
 -              handle_refs(submodule, revs, *flags, for_each_ref_submodule);
 -              handle_refs(submodule, revs, *flags, head_ref_submodule);
 +              handle_refs(refs, revs, *flags, refs_for_each_ref);
 +              handle_refs(refs, revs, *flags, refs_head_ref);
 +              if (!revs->single_worktree) {
 +                      struct all_refs_cb cb;
 +
 +                      init_all_refs_cb(&cb, revs, *flags);
 +                      other_head_refs(handle_one_ref, &cb);
 +              }
                clear_ref_exclusion(&revs->ref_excludes);
        } else if (!strcmp(arg, "--branches")) {
 -              handle_refs(submodule, revs, *flags, for_each_branch_ref_submodule);
 +              handle_refs(refs, revs, *flags, refs_for_each_branch_ref);
                clear_ref_exclusion(&revs->ref_excludes);
        } else if (!strcmp(arg, "--bisect")) {
                read_bisect_terms(&term_bad, &term_good);
 -              handle_refs(submodule, revs, *flags, for_each_bad_bisect_ref);
 -              handle_refs(submodule, revs, *flags ^ (UNINTERESTING | BOTTOM), for_each_good_bisect_ref);
 +              handle_refs(refs, revs, *flags, for_each_bad_bisect_ref);
 +              handle_refs(refs, revs, *flags ^ (UNINTERESTING | BOTTOM),
 +                          for_each_good_bisect_ref);
                revs->bisect = 1;
        } else if (!strcmp(arg, "--tags")) {
 -              handle_refs(submodule, revs, *flags, for_each_tag_ref_submodule);
 +              handle_refs(refs, revs, *flags, refs_for_each_tag_ref);
                clear_ref_exclusion(&revs->ref_excludes);
        } else if (!strcmp(arg, "--remotes")) {
 -              handle_refs(submodule, revs, *flags, for_each_remote_ref_submodule);
 +              handle_refs(refs, revs, *flags, refs_for_each_remote_ref);
                clear_ref_exclusion(&revs->ref_excludes);
        } else if ((argcount = parse_long_opt("glob", argv, &optarg))) {
                struct all_refs_cb cb;
        } else if ((argcount = parse_long_opt("exclude", argv, &optarg))) {
                add_ref_exclusion(&revs->ref_excludes, optarg);
                return argcount;
 -      } else if (starts_with(arg, "--branches=")) {
 +      } else if (skip_prefix(arg, "--branches=", &optarg)) {
                struct all_refs_cb cb;
                init_all_refs_cb(&cb, revs, *flags);
 -              for_each_glob_ref_in(handle_one_ref, arg + 11, "refs/heads/", &cb);
 +              for_each_glob_ref_in(handle_one_ref, optarg, "refs/heads/", &cb);
                clear_ref_exclusion(&revs->ref_excludes);
 -      } else if (starts_with(arg, "--tags=")) {
 +      } else if (skip_prefix(arg, "--tags=", &optarg)) {
                struct all_refs_cb cb;
                init_all_refs_cb(&cb, revs, *flags);
 -              for_each_glob_ref_in(handle_one_ref, arg + 7, "refs/tags/", &cb);
 +              for_each_glob_ref_in(handle_one_ref, optarg, "refs/tags/", &cb);
                clear_ref_exclusion(&revs->ref_excludes);
 -      } else if (starts_with(arg, "--remotes=")) {
 +      } else if (skip_prefix(arg, "--remotes=", &optarg)) {
                struct all_refs_cb cb;
                init_all_refs_cb(&cb, revs, *flags);
 -              for_each_glob_ref_in(handle_one_ref, arg + 10, "refs/remotes/", &cb);
 +              for_each_glob_ref_in(handle_one_ref, optarg, "refs/remotes/", &cb);
                clear_ref_exclusion(&revs->ref_excludes);
        } else if (!strcmp(arg, "--reflog")) {
                add_reflogs_to_pending(revs, *flags);
                *flags ^= UNINTERESTING | BOTTOM;
        } else if (!strcmp(arg, "--no-walk")) {
                revs->no_walk = REVISION_WALK_NO_WALK_SORTED;
 -      } else if (starts_with(arg, "--no-walk=")) {
 +      } else if (skip_prefix(arg, "--no-walk=", &optarg)) {
                /*
                 * Detached form ("--no-walk X" as opposed to "--no-walk=X")
                 * not allowed, since the argument is optional.
                 */
 -              if (!strcmp(arg + 10, "sorted"))
 +              if (!strcmp(optarg, "sorted"))
                        revs->no_walk = REVISION_WALK_NO_WALK_SORTED;
 -              else if (!strcmp(arg + 10, "unsorted"))
 +              else if (!strcmp(optarg, "unsorted"))
                        revs->no_walk = REVISION_WALK_NO_WALK_UNSORTED;
                else
                        return error("invalid argument to --no-walk");
        } else if (!strcmp(arg, "--do-walk")) {
                revs->no_walk = 0;
 +      } else if (!strcmp(arg, "--single-worktree")) {
 +              revs->single_worktree = 1;
        } else {
                return 0;
        }
  
  static void NORETURN diagnose_missing_default(const char *def)
  {
 -      unsigned char sha1[20];
        int flags;
        const char *refname;
  
 -      refname = resolve_ref_unsafe(def, 0, sha1, &flags);
 +      refname = resolve_ref_unsafe(def, 0, NULL, &flags);
        if (!refname || !(flags & REF_ISSYMREF) || (flags & REF_ISBROKEN))
                die(_("your current branch appears to be broken"));
  
  int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct setup_revision_opt *opt)
  {
        int i, flags, left, seen_dashdash, read_from_stdin, got_rev_arg = 0, revarg_opt;
 -      struct cmdline_pathspec prune_data;
 +      struct argv_array prune_data = ARGV_ARRAY_INIT;
        const char *submodule = NULL;
  
 -      memset(&prune_data, 0, sizeof(prune_data));
        if (opt)
                submodule = opt->submodule;
  
                        argv[i] = NULL;
                        argc = i;
                        if (argv[i + 1])
 -                              append_prune_data(&prune_data, argv + i + 1);
 +                              argv_array_pushv(&prune_data, argv + i + 1);
                        seen_dashdash = 1;
                        break;
                }
                        for (j = i; j < argc; j++)
                                verify_filename(revs->prefix, argv[j], j == i);
  
 -                      append_prune_data(&prune_data, argv + i);
 +                      argv_array_pushv(&prune_data, argv + i);
                        break;
                }
                else
                        got_rev_arg = 1;
        }
  
 -      if (prune_data.nr) {
 +      if (prune_data.argc) {
                /*
                 * If we need to introduce the magic "a lone ':' means no
                 * pathspec whatsoever", here is the place to do so.
                 *      call init_pathspec() to set revs->prune_data here.
                 * }
                 */
 -              ALLOC_GROW(prune_data.path, prune_data.nr + 1, prune_data.alloc);
 -              prune_data.path[prune_data.nr++] = NULL;
                parse_pathspec(&revs->prune_data, 0, 0,
 -                             revs->prefix, prune_data.path);
 +                             revs->prefix, prune_data.argv);
        }
 +      argv_array_clear(&prune_data);
  
        if (revs->def == NULL)
                revs->def = opt ? opt->def : NULL;
                opt->tweak(revs, opt);
        if (revs->show_merge)
                prepare_show_merge(revs);
 -      if (revs->def && !revs->pending.nr && !got_rev_arg) {
 -              unsigned char sha1[20];
 +      if (revs->def && !revs->pending.nr && !revs->rev_input_given && !got_rev_arg) {
 +              struct object_id oid;
                struct object *object;
                struct object_context oc;
 -              if (get_sha1_with_context(revs->def, 0, sha1, &oc))
 +              if (get_oid_with_context(revs->def, 0, &oid, &oc))
                        diagnose_missing_default(revs->def);
 -              object = get_reference(revs, revs->def, sha1, 0);
 +              object = get_reference(revs, revs->def, &oid, 0);
                add_pending_object_with_mode(revs, object, revs->def, oc.mode);
        }
  
                revs->diff = 1;
  
        /* Pickaxe, diff-filter and rename following need diffs */
 -      if (revs->diffopt.pickaxe ||
 +      if ((revs->diffopt.pickaxe_opts & DIFF_PICKAXE_KINDS_MASK) ||
            revs->diffopt.filter ||
 -          DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
 +          revs->diffopt.flags.follow_renames)
                revs->diff = 1;
  
 +      if (revs->diffopt.objfind)
 +              revs->simplify_history = 0;
 +
        if (revs->topo_order)
                revs->limited = 1;
  
        if (revs->prune_data.nr) {
                copy_pathspec(&revs->pruning.pathspec, &revs->prune_data);
                /* Can't prune commits with rename following: the paths change.. */
 -              if (!DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
 +              if (!revs->diffopt.flags.follow_renames)
                        revs->prune = 1;
                if (!revs->full_diff)
                        copy_pathspec(&revs->diffopt.pathspec,
  
        if (revs->reverse && revs->reflog_info)
                die("cannot combine --reverse with --walk-reflogs");
 +      if (revs->reflog_info && revs->limited)
 +              die("cannot combine --walk-reflogs with history-limiting options");
        if (revs->rewrite_parents && revs->children.name)
                die("cannot combine --parents and --children");
  
@@@ -2853,16 -2733,6 +2854,16 @@@ void reset_revision_walk(void
        clear_object_flags(SEEN | ADDED | SHOWN);
  }
  
 +static int mark_uninteresting(const struct object_id *oid,
 +                            struct packed_git *pack,
 +                            uint32_t pos,
 +                            void *unused)
 +{
 +      struct object *o = parse_object(oid);
 +      o->flags |= UNINTERESTING | SEEN;
 +      return 0;
 +}
 +
  int prepare_revision_walk(struct rev_info *revs)
  {
        int i;
                        }
                }
        }
 -      if (!revs->leak_pending)
 -              object_array_clear(&old_pending);
 +      object_array_clear(&old_pending);
  
        /* Signal whether we need per-parent treesame decoration */
        if (revs->simplify_merges ||
            (revs->limited && limiting_can_increase_treesame(revs)))
                revs->treesame.name = "treesame";
  
 +      if (revs->exclude_promisor_objects) {
 +              for_each_packed_object(mark_uninteresting, NULL,
 +                                     FOR_EACH_OBJECT_PROMISOR_ONLY);
 +      }
 +
        if (revs->no_walk != REVISION_WALK_NO_WALK_UNSORTED)
                commit_list_sort_by_date(&revs->commits);
        if (revs->no_walk)
@@@ -3043,7 -2909,7 +3044,7 @@@ static int commit_match(struct commit *
        if (opt->show_notes) {
                if (!buf.len)
                        strbuf_addstr(&buf, message);
 -              format_display_notes(commit->object.oid.hash, &buf, encoding, 1);
 +              format_display_notes(&commit->object.oid, &buf, encoding, 1);
        }
  
        /*
@@@ -3069,29 -2935,18 +3070,29 @@@ static inline int want_ancestry(const s
        return (revs->rewrite_parents || revs->children.name);
  }
  
 +/*
 + * Return a timestamp to be used for --since/--until comparisons for this
 + * commit, based on the revision options.
 + */
 +static timestamp_t comparison_date(const struct rev_info *revs,
 +                                 struct commit *commit)
 +{
 +      return revs->reflog_info ?
 +              get_reflog_timestamp(revs->reflog_info) :
 +              commit->date;
 +}
 +
  enum commit_action get_commit_action(struct rev_info *revs, struct commit *commit)
  {
        if (commit->object.flags & SHOWN)
                return commit_ignore;
        if (revs->unpacked && has_sha1_pack(commit->object.oid.hash))
                return commit_ignore;
 -      if (revs->show_all)
 -              return commit_show;
        if (commit->object.flags & UNINTERESTING)
                return commit_ignore;
 -      if (revs->min_age != -1 && (commit->date > revs->min_age))
 -              return commit_ignore;
 +      if (revs->min_age != -1 &&
 +          comparison_date(revs, commit) > revs->min_age)
 +                      return commit_ignore;
        if (revs->min_parents || (revs->max_parents >= 0)) {
                int n = commit_list_count(commit->parents);
                if ((n < revs->min_parents) ||
@@@ -3185,6 -3040,7 +3186,6 @@@ enum commit_action simplify_commit(stru
        enum commit_action action = get_commit_action(revs, commit);
  
        if (action == commit_show &&
 -          !revs->show_all &&
            revs->prune && revs->dense && want_ancestry(revs)) {
                /*
                 * --full-diff on simplified parents is no good: it
@@@ -3223,19 -3079,17 +3224,19 @@@ static void track_linear(struct rev_inf
  
  static struct commit *get_revision_1(struct rev_info *revs)
  {
 -      if (!revs->commits)
 -              return NULL;
 +      while (1) {
 +              struct commit *commit;
  
 -      do {
 -              struct commit *commit = pop_commit(&revs->commits);
 +              if (revs->reflog_info)
 +                      commit = next_reflog_entry(revs->reflog_info);
 +              else
 +                      commit = pop_commit(&revs->commits);
  
 -              if (revs->reflog_info) {
 -                      save_parents(revs, commit);
 -                      fake_reflog_parent(revs->reflog_info, commit);
 +              if (!commit)
 +                      return NULL;
 +
 +              if (revs->reflog_info)
                        commit->object.flags &= ~(ADDED | SEEN | SHOWN);
 -              }
  
                /*
                 * If we haven't done the list limiting, we need to look at
                 */
                if (!revs->limited) {
                        if (revs->max_age != -1 &&
 -                          (commit->date < revs->max_age))
 +                          comparison_date(revs, commit) < revs->max_age)
                                continue;
 -                      if (add_parents_to_list(revs, commit, &revs->commits, NULL) < 0) {
 +
 +                      if (revs->reflog_info)
 +                              try_to_simplify_commit(revs, commit);
 +                      else if (add_parents_to_list(revs, commit, &revs->commits, NULL) < 0) {
                                if (!revs->ignore_missing_links)
                                        die("Failed to traverse parents of commit %s",
                                                oid_to_hex(&commit->object.oid));
                                track_linear(revs, commit);
                        return commit;
                }
 -      } while (revs->commits);
 -      return NULL;
 +      }
  }
  
  /*