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name-rev: pull out deref handling from the recursion

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The 'if (deref) { ... }' condition near the beginning of the recursive
name_rev() function can only ever be true in the first invocation,
because the 'deref' parameter is always 0 in the subsequent recursive
invocations.

Extract this condition from the recursion into name_rev()'s caller and
drop the function's 'deref' parameter.  This makes eliminating the
recursion a bit easier to follow, and it will be moved back into
name_rev() after the recursion is eliminated.

Furthermore, drop the condition that die()s when both 'deref' and
'generation' are non-null (which should have been a BUG() to begin
with).

Note that this change reintroduces the memory leak that was plugged in
in commit 5308224633 (name-rev: avoid leaking memory in the `deref`
case, 2017-05-04), but a later patch (name-rev: restructure
creating/updating 'struct rev_name' instances) in this series will
plug it in again.

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
SZEDER Gábor 2019-11-12 11:38:16 +01:00 committed by Junio C Hamano
parent 766f9e39c0
commit dd090a8a37
1 changed files with 10 additions and 17 deletions
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27
builtin/name-rev.c
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@ -106,30 +106,19 @@ copy_data:
static void name_rev(struct commit *commit,
const char *tip_name, timestamp_t taggerdate,
int generation, int distance, int from_tag,
int deref)
int generation, int distance, int from_tag)
{
struct commit_list *parents;
int parent_number = 1;
char *to_free = NULL;
parse_commit(commit);
if (commit->date < cutoff)
return;
if (deref) {
tip_name = to_free = xstrfmt("%s^0", tip_name);
if (generation)
die("generation: %d, but deref?", generation);
}
if (!create_or_update_name(commit, tip_name, taggerdate, generation,
distance, from_tag)) {
free(to_free);
distance, from_tag))
return;
}
for (parents = commit->parents;
parents;
@ -148,11 +137,11 @@ static void name_rev(struct commit *commit,
name_rev(parents->item, new_name, taggerdate, 0,
distance + MERGE_TRAVERSAL_WEIGHT,
from_tag, 0);
from_tag);
} else {
name_rev(parents->item, tip_name, taggerdate,
generation + 1, distance + 1,
from_tag, 0);
from_tag);
}
}
}
@ -284,12 +273,16 @@ static int name_ref(const char *path, const struct object_id *oid, int flags, vo
if (o && o->type == OBJ_COMMIT) {
struct commit *commit = (struct commit *)o;
int from_tag = starts_with(path, "refs/tags/");
const char *tip_name;
if (taggerdate == TIME_MAX)
taggerdate = commit->date;
path = name_ref_abbrev(path, can_abbreviate_output);
name_rev(commit, xstrdup(path), taggerdate, 0, 0,
from_tag, deref);
if (deref)
tip_name = xstrfmt("%s^0", path);
else
tip_name = xstrdup(path);
name_rev(commit, tip_name, taggerdate, 0, 0, from_tag);
}
return 0;
}