get_merge_bases(): always clean-up object flagsjc/merge-bases

The callers of get_merge_bases() can choose to leave object flags
used during the merge-base traversal by passing cleanup=0 as a
parameter, but in practice a very few callers can afford to do so
(namely, "git merge-base"), as they need to compute merge base in
preparation for other processing of their own and they need to see
the object without contaminate flags.

Change the function signature of get_merge_bases_many() and
get_merge_bases() to drop the cleanup parameter, so that the
majority of the callers do not have to say ", 1" at the end.

Give a new get_merge_bases_many_dirty() API to support only a few
callers that know they do not need to spend cycles cleaning up the
object flags.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/commit.h b/commit.h
index 2e1492a6e4..7cd4503581 100644
--- a/commit.h
+++ b/commit.h
@@ -223,10 +223,13 @@ struct commit_graft *read_graft_line(char *buf, int len);
 int register_commit_graft(struct commit_graft *, int);
 struct commit_graft *lookup_commit_graft(const unsigned char *sha1);
 
-extern struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2, int cleanup);
-extern struct commit_list *get_merge_bases_many(struct commit *one, int n, struct commit **twos, int cleanup);
+extern struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2);
+extern struct commit_list *get_merge_bases_many(struct commit *one, int n, struct commit **twos);
 extern struct commit_list *get_octopus_merge_bases(struct commit_list *in);
 
+/* To be used only when object flags after this call no longer matter */
+extern struct commit_list *get_merge_bases_many_dirty(struct commit *one, int n, struct commit **twos);
+
 /* largest positive number a signed 32-bit integer can contain */
 #define INFINITE_DEPTH 0x7fffffff