On 1/29/2021 12:11 PM, René Scharfe wrote:
> Am 28.01.21 um 21:51 schrieb Junio C Hamano:
>> "Derrick Stolee via GitGitGadget" <gitgitgadget@xxxxxxxxx> writes:
>>> + /* rearrange array */
>>> + dup = xcalloc(cnt, sizeof(struct commit *));
>>> + COPY_ARRAY(dup, array, cnt);
>>> + for (i = 0; i < cnt; i++) {
>>> + if (dup[i]->object.flags & STALE) {
>>> + int insert = cnt - 1 - (i - count_non_stale);
>>> + array[insert] = dup[i];
>>> + } else {
>>> + array[count_non_stale] = dup[i];
>>> + count_non_stale++;
>>> + }
>>> + }
>>> + free(dup);
>>
>> The "fill stale ones from the end, non-stale ones from the
>> beginning" in the loop looks unnecessarily complex to me. I wonder
>> if we can do only the "fill non-stale ones from the beginning" half,
>> i.e.
>>
>> for (i = count_non_stale = 0; i < cnt; i++) {
>> if (dup[i] is not stale)
>> array[count_non_stale++] = dup[i];
>> }
>>
>> without the "keep the stale one at the end of array[]", and clear
>> marks using what is in dup[] as starting points before discarding
>> dup[]?
>>
>> Or do the callers still look at the entries beyond count_non_stale?
>
> Had the same reaction. Both callers ignore the stale entries.
Ok, I can update that logic accordingly. I wanted to keep consistent
with the comment at the start of the method:
/*
* Some commit in the array may be an ancestor of
* another commit. Move such commit to the end of
* the array, and return the number of commits that
* are independent from each other.
*/
but if no caller actually needs that, then I can remove this
behavior. Anyone mind if it is a follow-up patch to change this
part of the behavior?
>> Other than that, nicely done.
>>
>>> + /* clear marks */
>>> + for (i = 0; i < cnt; i++) {
>>> + struct commit_list *parents;
>>> + parents = array[i]->parents;
>>> +
>>> + while (parents) {
>>> + clear_commit_marks(parents->item, STALE);
>>> + parents = parents->next;
>>> }
>
> This loop clears STALE from the parents of both the non-stale and
> stale entries. OK. Should it also clear it from the stale entries
> themselves?
clear_commit_marks() walks commits starting from the input commit
(parents->item in this case) and clears the STALE bit as long as
it is present. This way, the accumulated clear_commit_marks() will
walk each commit only once _and_ will visit any of the commits from
'array' that received the STALE bit during the above walk.
Thanks,
-Stolee
