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cocci: generalize "unused" rule to cover more than "strbuf"

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Generalize the newly added "unused.cocci" rule to find more than just
"struct strbuf", let's have it find the same unused patterns for
"struct string_list", as well as other code that uses
similar-looking *_{release,clear,free}() and {release,clear,free}_*()
functions.

We're intentionally loose in accepting e.g. a "strbuf_init(&sb)"
followed by a "string_list_clear(&sb, 0)".  It's assumed that the
compiler will catch any such invalid code, i.e. that our
constructors/destructors don't take a "void *".

See [1] for example of code that would be covered by the
"get_worktrees()" part of this rule. We'd still need work that the
series is based on (we were passing "worktrees" to a function), but
could now do the change in [1] automatically.

1. https://lore.kernel.org/git/Yq6eJFUPPTv%2Fzc0o@coredump.intra.peff.net/

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
2022-07-05 15:47:00 +02:00
committed by Junio C Hamano
parent 4f40f6cb73
commit 06f5f8940c
4 changed files with 57 additions and 6 deletions
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2
builtin/repack.c
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@ -727,7 +727,6 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
struct child_process cmd = CHILD_PROCESS_INIT;
struct string_list_item *item;
struct string_list names = STRING_LIST_INIT_DUP;
struct string_list rollback = STRING_LIST_INIT_NODUP;
struct string_list existing_nonkept_packs = STRING_LIST_INIT_DUP;
struct string_list existing_kept_packs = STRING_LIST_INIT_DUP;
struct pack_geometry *geometry = NULL;
@ -1117,7 +1116,6 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
}
string_list_clear(&names, 0);
string_list_clear(&rollback, 0);
string_list_clear(&existing_nonkept_packs, 0);
string_list_clear(&existing_kept_packs, 0);
clear_pack_geometry(geometry);