From: Jeff King <peff@peff.net>
To: Junio C Hamano <gitster@pobox.com>
Cc: "Christian Couder" <christian.couder@gmail.com>,
git@vger.kernel.org, "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
"Jonathan Tan" <jonathantanmy@google.com>,
"SZEDER Gábor" <szeder.dev@gmail.com>,
"Christian Couder" <chriscool@tuxfamily.org>
Subject: Re: [PATCH 01/17] describe: fix accidental oid/hash type-punning
Date: Thu, 20 Jun 2019 14:25:28 -0400 [thread overview]
Message-ID: <20190620182527.GB18704@sigill.intra.peff.net> (raw)
In-Reply-To: <xmqq7e9gp68e.fsf@gitster-ct.c.googlers.com>
On Thu, Jun 20, 2019 at 09:32:49AM -0700, Junio C Hamano wrote:
> Jeff King <peff@peff.net> writes:
>
> > The find_commit_name() function passes an object_id.hash as the key of a
> > hashmap. That ends up in commit_name_neq(), which then feeds it to
> > oideq(). Which means we should actually be the whole "struct object_id".
> >
> > It works anyway because pointers to the two are interchangeable. And
> > because we're going through a layer of void pointers, the compiler
> > doesn't notice the type mismatch.
>
> Wow. Good eyes. I wouldn't have noticed this (and for the reasons
> you stated, it is very tricky for any clever compiler to notice it).
>
> Impressed.
It only looks impressive in retrospect. It became very obvious when
updating the reference to sha1hash(peeled->hash) in the same line, and
then scratching my head about why this one was looking at the hash
member. But history rewriting lets me re-order it to make myself look
good. Thanks, "rebase -i"! :)
-Peff
next prev parent reply other threads:[~2019-06-20 18:25 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-15 10:06 [PATCH v4 0/4] Test oidmap Christian Couder
2019-06-15 10:06 ` [PATCH v4 1/4] t/helper: add test-oidmap.c Christian Couder
2019-06-15 10:07 ` [PATCH v4 2/4] t: add t0016-oidmap.sh Christian Couder
2019-06-15 10:07 ` [PATCH v4 3/4] oidmap: use sha1hash() instead of static hash() function Christian Couder
2019-06-15 10:07 ` [PATCH v4 4/4] test-hashmap: remove 'hash' command Christian Couder
2019-06-19 21:42 ` [PATCH v4 0/4] Test oidmap Jeff King
2019-06-19 22:09 ` Jeff King
2019-06-19 22:25 ` Christian Couder
2019-06-20 7:39 ` [PATCH 0/17] drop non-object_id hashing Jeff King
2019-06-20 7:40 ` [PATCH 01/17] describe: fix accidental oid/hash type-punning Jeff King
2019-06-20 16:32 ` Junio C Hamano
2019-06-20 18:25 ` Jeff King [this message]
2019-06-20 7:40 ` [PATCH 02/17] upload-pack: rename a "sha1" variable to "oid" Jeff King
2019-06-20 7:40 ` [PATCH 03/17] pack-bitmap-write: convert some helpers to use object_id Jeff King
2019-06-20 7:41 ` [PATCH 04/17] pack-objects: convert packlist_find() " Jeff King
2019-06-20 7:41 ` [PATCH 05/17] pack-objects: convert locate_object_entry_hash() to object_id Jeff King
2019-06-20 7:41 ` [PATCH 06/17] object: convert lookup_unknown_object() to use object_id Jeff King
2019-06-20 7:41 ` [PATCH 07/17] object: convert lookup_object() " Jeff King
2019-06-20 7:41 ` [PATCH 08/17] object: convert internal hash_obj() to object_id Jeff King
2019-06-20 7:41 ` [PATCH 09/17] object: convert create_object() to use object_id Jeff King
2019-06-20 14:21 ` Ramsay Jones
2019-06-20 18:23 ` Jeff King
2019-06-20 7:41 ` [PATCH 10/17] khash: drop broken oid_map typedef Jeff King
2019-06-20 7:41 ` [PATCH 11/17] khash: rename kh_oid_t to kh_oid_set Jeff King
2019-06-20 7:41 ` [PATCH 12/17] delta-islands: convert island_marks khash to use oids Jeff King
2019-06-20 17:38 ` Jonathan Tan
2019-06-20 18:29 ` Jeff King
2019-06-20 7:41 ` [PATCH 13/17] pack-bitmap: convert khash_sha1 maps into kh_oid_map Jeff King
2019-06-20 7:41 ` [PATCH 14/17] khash: drop sha1-specific map types Jeff King
2019-06-20 7:41 ` [PATCH 15/17] khash: rename oid helper functions Jeff King
2019-06-20 17:44 ` Junio C Hamano
2019-06-20 18:27 ` Jeff King
2019-06-23 16:00 ` René Scharfe
2019-06-23 22:46 ` Jeff King
2019-06-20 7:41 ` [PATCH 16/17] hash.h: move object_id definition from cache.h Jeff King
2019-06-20 17:41 ` Junio C Hamano
2019-06-20 7:41 ` [PATCH 17/17] hashmap: convert sha1hash() to oidhash() Jeff King
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