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Eliminate recursion in setting/clearing marks in commit list

Browse source 
Recursion in a DAG is generally a bad idea because it could be very
deep. Be defensive and avoid recursion in mark_parents_uninteresting()
and clear_commit_marks().

mark_parents_uninteresting() learns a trick from clear_commit_marks()
to avoid malloc() in (dominant) single-parent case.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2012-01-14 19:19:53 +07:00 committed by Junio C Hamano
parent ec330158ec
commit 941ba8db57
2 changed files with 40 additions and 18 deletions
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13
commit.c
View file

@ -421,7 +421,8 @@ struct commit *pop_most_recent_commit(struct commit_list **list,
return ret;
}
void clear_commit_marks(struct commit *commit, unsigned int mark)
static void clear_commit_marks_1(struct commit_list **plist,
struct commit *commit, unsigned int mark)
{
while (commit) {
struct commit_list *parents;
@ -436,12 +437,20 @@ void clear_commit_marks(struct commit *commit, unsigned int mark)
return;
while ((parents = parents->next))
clear_commit_marks(parents->item, mark);
commit_list_insert(parents->item, plist);
commit = commit->parents->item;
}
}
void clear_commit_marks(struct commit *commit, unsigned int mark)
{
struct commit_list *list = NULL;
commit_list_insert(commit, &list);
while (list)
clear_commit_marks_1(&list, pop_commit(&list), mark);
}
void clear_commit_marks_for_object_array(struct object_array *a, unsigned mark)
{
struct object *object;

45
revision.c
View file

@ -139,11 +139,32 @@ void mark_tree_uninteresting(struct tree *tree)
void mark_parents_uninteresting(struct commit *commit)
{
struct commit_list *parents = commit->parents;
struct commit_list *parents = NULL, *l;
for (l = commit->parents; l; l = l->next)
commit_list_insert(l->item, &parents);
while (parents) {
struct commit *commit = parents->item;
if (!(commit->object.flags & UNINTERESTING)) {
l = parents;
parents = parents->next;
free(l);
while (commit) {
/*
* A missing commit is ok iff its parent is marked
* uninteresting.
*
* We just mark such a thing parsed, so that when
* it is popped next time around, we won't be trying
* to parse it and get an error.
*/
if (!has_sha1_file(commit->object.sha1))
commit->object.parsed = 1;
if (commit->object.flags & UNINTERESTING)
break;
commit->object.flags |= UNINTERESTING;
/*
@ -154,21 +175,13 @@ void mark_parents_uninteresting(struct commit *commit)
* wasn't uninteresting), in which case we need
* to mark its parents recursively too..
*/
if (commit->parents)
mark_parents_uninteresting(commit);
}
if (!commit->parents)
break;
/*
* A missing commit is ok iff its parent is marked
* uninteresting.
*
* We just mark such a thing parsed, so that when
* it is popped next time around, we won't be trying
* to parse it and get an error.
*/
if (!has_sha1_file(commit->object.sha1))
commit->object.parsed = 1;
parents = parents->next;
for (l = commit->parents->next; l; l = l->next)
commit_list_insert(l->item, &parents);
commit = commit->parents->item;
}
}
}