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revision --simplify-merges: use decoration instead of commit->util field

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The users of revision walking machinery may want to use the util pointer
for their own use.  Use decoration to hold the data needed during merge
simplification instead.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2008-08-14 10:59:44 -07:00
parent 6534703059
commit faf0156b27
2 changed files with 38 additions and 12 deletions
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49
revision.c
View File

@ -1408,16 +1408,34 @@ static int remove_duplicate_parents(struct commit *commit)
return surviving_parents;
}
static struct commit_list **simplify_one(struct commit *commit, struct commit_list **tail)
struct merge_simplify_state {
struct commit *simplified;
};
static struct merge_simplify_state *locate_simplify_state(struct rev_info *revs, struct commit *commit)
{
struct merge_simplify_state *st;
st = lookup_decoration(&revs->merge_simplification, &commit->object);
if (!st) {
st = xcalloc(1, sizeof(*st));
add_decoration(&revs->merge_simplification, &commit->object, st);
}
return st;
}
static struct commit_list **simplify_one(struct rev_info *revs, struct commit *commit, struct commit_list **tail)
{
struct commit_list *p;
struct merge_simplify_state *st, *pst;
int cnt;
st = locate_simplify_state(revs, commit);
/*
* We store which commit each one simplifies to in its util field.
* Have we handled this one?
*/
if (commit->util)
if (st->simplified)
return tail;
/*
@ -1426,7 +1444,7 @@ static struct commit_list **simplify_one(struct commit *commit, struct commit_li
* anyway.
*/
if ((commit->object.flags & UNINTERESTING) || !commit->parents) {
commit->util = commit;
st->simplified = commit;
return tail;
}
@ -1435,7 +1453,8 @@ static struct commit_list **simplify_one(struct commit *commit, struct commit_li
* Otherwise we are not ready to rewrite this one yet.
*/
for (cnt = 0, p = commit->parents; p; p = p->next) {
if (!p->item->util) {
pst = locate_simplify_state(revs, p->item);
if (!pst->simplified) {
tail = &commit_list_insert(p->item, tail)->next;
cnt++;
}
@ -1446,8 +1465,10 @@ static struct commit_list **simplify_one(struct commit *commit, struct commit_li
/*
* Rewrite our list of parents.
*/
for (p = commit->parents; p; p = p->next)
p->item = p->item->util;
for (p = commit->parents; p; p = p->next) {
pst = locate_simplify_state(revs, p->item);
p->item = pst->simplified;
}
cnt = remove_duplicate_parents(commit);
/*
@ -1482,9 +1503,11 @@ static struct commit_list **simplify_one(struct commit *commit, struct commit_li
(commit->object.flags & UNINTERESTING) ||
!(commit->object.flags & TREESAME) ||
(1 < cnt))
commit->util = commit;
else
commit->util = commit->parents->item->util;
st->simplified = commit;
else {
pst = locate_simplify_state(revs, commit->parents->item);
st->simplified = pst->simplified;
}
return tail;
}
@ -1508,7 +1531,7 @@ static void simplify_merges(struct rev_info *revs)
struct commit_list *next = list->next;
free(list);
list = next;
tail = simplify_one(commit, tail);
tail = simplify_one(revs, commit, tail);
}
}
@ -1519,9 +1542,11 @@ static void simplify_merges(struct rev_info *revs)
while (list) {
struct commit *commit = list->item;
struct commit_list *next = list->next;
struct merge_simplify_state *st;
free(list);
list = next;
if (commit->util == commit)
st = locate_simplify_state(revs, commit);
if (st->simplified == commit)
tail = &commit_list_insert(commit, tail)->next;
}
}

1
revision.h
View File

@ -110,6 +110,7 @@ struct rev_info {
struct reflog_walk_info *reflog_info;
struct decoration children;
struct decoration merge_simplification;
};
#define REV_TREE_SAME 0