From 60fcc2e6ce255da1baa92905c10456981d260fa0 Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Wed, 10 Oct 2007 23:14:35 +0100 Subject: [PATCH] clear_commit_marks(): avoid deep recursion Before this patch, clear_commit_marks() recursed for each parent. This could be potentially very expensive in terms of stack space. Probably the only reason that this did not lead to problems is the fact that we typically call clear_commit_marks() after marking a relatively small set of commits. Use (sort of) a tail recursion instead: first recurse on the parents other than the first one, and then continue the loop with the first parent. Noticed by Shawn Pearce. Signed-off-by: Johannes Schindelin Signed-off-by: Lars Hjemli Signed-off-by: Shawn O. Pearce --- commit.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/commit.c b/commit.c index dc5a0643f3..1fbdd2d51b 100644 --- a/commit.c +++ b/commit.c @@ -441,17 +441,22 @@ struct commit *pop_most_recent_commit(struct commit_list **list, void clear_commit_marks(struct commit *commit, unsigned int mark) { - struct commit_list *parents; + while (commit) { + struct commit_list *parents; - commit->object.flags &= ~mark; - parents = commit->parents; - while (parents) { - struct commit *parent = parents->item; + if (!(mark & commit->object.flags)) + return; - /* Have we already cleared this? */ - if (mark & parent->object.flags) - clear_commit_marks(parent, mark); - parents = parents->next; + commit->object.flags &= ~mark; + + parents = commit->parents; + if (!parents) + return; + + while ((parents = parents->next)) + clear_commit_marks(parents->item, mark); + + commit = commit->parents->item; } } -- 2.39.2