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revisions API: have release_revisions() release "topo_walk_info"

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Refactor the existing reset_topo_walk() into a thin wrapper for a
release_revisions_topo_walk_info() + resetting the member to "NULL",
and call release_revisions_topo_walk_info() from release_revisions().

This fixes memory leaks that have been with us ever since
"topo_walk_info" was added to revision.[ch] in
f0d9cc4196 (revision.c: begin refactoring --topo-order logic,
2018-11-01).

Due to various other leaks this makes no tests pass in their entirety,
but e.g. before this running this on git.git:

    ./git -P log --pretty=tformat:"%P   %H | %s" --parents --full-history --topo-order -3 -- README.md

Would report under SANITIZE=leak:

    SUMMARY: LeakSanitizer: 531064 byte(s) leaked in 6 allocation(s).

Now we'll free all of that memory.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2022-04-14 07:56:39 +02:00 committed by Junio C Hamano
parent 9d5a7df332
commit ae1b383dfa
1 changed files with 12 additions and 4 deletions
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16
revision.c
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@ -2943,6 +2943,8 @@ static void release_revisions_mailmap(struct string_list *mailmap)
free(mailmap);
}
static void release_revisions_topo_walk_info(struct topo_walk_info *info);
void release_revisions(struct rev_info *revs)
{
free_commit_list(revs->commits);
@ -2956,6 +2958,7 @@ void release_revisions(struct rev_info *revs)
free_grep_patterns(&revs->grep_filter);
diff_free(&revs->pruning);
reflog_walk_info_release(revs->reflog_info);
release_revisions_topo_walk_info(revs->topo_walk_info);
}
static void add_child(struct rev_info *revs, struct commit *parent, struct commit *child)
@ -3468,17 +3471,22 @@ static void compute_indegrees_to_depth(struct rev_info *revs,
indegree_walk_step(revs);
}
static void reset_topo_walk(struct rev_info *revs)
static void release_revisions_topo_walk_info(struct topo_walk_info *info)
{
struct topo_walk_info *info = revs->topo_walk_info;
if (!info)
return;
clear_prio_queue(&info->explore_queue);
clear_prio_queue(&info->indegree_queue);
clear_prio_queue(&info->topo_queue);
clear_indegree_slab(&info->indegree);
clear_author_date_slab(&info->author_date);
free(info);
}
FREE_AND_NULL(revs->topo_walk_info);
static void reset_topo_walk(struct rev_info *revs)
{
release_revisions_topo_walk_info(revs->topo_walk_info);
revs->topo_walk_info = NULL;
}
static void init_topo_walk(struct rev_info *revs)