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From: Matthew DeVore <matvore@comcast.net>
To: Jacob Keller <jacob.keller@gmail.com>
Cc: Matthew DeVore <matvore@google.com>,
	Git mailing list <git@vger.kernel.org>,
	Jonathan Tan <jonathantanmy@google.com>,
	jrn@google.com, dstolee@microsoft.com,
	Jeff Hostetler <jeffhost@microsoft.com>,
	Jonathan Nieder <jrnieder@gmail.com>,
	Duy Nguyen <pclouds@gmail.com>,
	Emily Shaffer <emilyshaffer@google.com>
Subject: Re: [PATCH v2 8/9] list-objects-filter-options: clean up use of ALLOC_GROW
Date: Mon, 3 Jun 2019 15:39:25 -0700	[thread overview]
Message-ID: <20190603223925.GH4641@comcast.net> (raw)
In-Reply-To: <CA+P7+xqqS8wMeNw1E8yXzStNHgrCU5ME1wpWckbPA7pBD3OBHg@mail.gmail.com>

On Mon, Jun 03, 2019 at 03:07:40PM -0700, Jacob Keller wrote:
> > +/*
> > + * Similar to ALLOC_GROW but handles updating of the nr value and
> > + * zeroing the bytes of the newly-grown array elements.
> > + *
> > + * DO NOT USE any expression with side-effect for any of the
> > + * arguments.
> > + */
> 
> Since ALLOC_GROW already doesn't handle this safely, there isn't
> necessarily a reason to fix it, but you could read the macro values
> into temporary variables inside the do { } while(0) loop in order to
> avoid the multiple-expansion side effect issues...

For x I don't think that's possible since we don't know the pointer type. For
nr and alloc it doesn't make sense since they're being assigned to. For
`increase` I could try this:

	size_t ALLOC_GROW_BY__increase = (increase);

but I'm not sure how well this works when `increase` is a signed type. This
seemed sufficiently pitfall-y that I didn't attempt it. Relatedly, I was
thinking something like this would be nice, if anyone has time for such a
refactor:

struct growth_info {
	size_t nr, alloc;
}

And use that to replace individual "size_t foo_nr, foo_alloc"

And make ALLOC_GROW_BY use it. I think a bulk, maybe even most, ALLOC_GROW
invocations can be changed to ALLOC_GROW_BY.

  reply	other threads:[~2019-06-03 22:39 UTC|newest]

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-01  0:35 [PATCH v2 0/9] Filter combination Matthew DeVore
2019-06-01  0:35 ` [PATCH v2 1/9] list-objects-filter: make API easier to use Matthew DeVore
2019-06-01  0:35 ` [PATCH v2 2/9] list-objects-filter: put omits set in filter struct Matthew DeVore
2019-06-01  0:35 ` [PATCH v2 3/9] list-objects-filter-options: always supply *errbuf Matthew DeVore
2019-06-01  0:35 ` [PATCH v2 4/9] list-objects-filter: implement composite filters Matthew DeVore
2019-06-03 21:51   ` Jeff Hostetler
2019-06-06 22:32     ` Matthew DeVore
2019-06-07 17:58       ` Jeff Hostetler
2019-06-01  0:35 ` [PATCH v2 5/9] list-objects-filter-options: move error check up Matthew DeVore
2019-06-01  0:36 ` [PATCH v2 6/9] list-objects-filter-options: make filter_spec a strbuf Matthew DeVore
2019-06-10 20:13   ` Junio C Hamano
2019-06-11  0:34     ` Matthew DeVore
2019-06-11 17:33       ` Junio C Hamano
2019-06-11 18:44         ` Matthew DeVore
2019-06-11 21:34           ` Matthew DeVore
2019-06-11 21:48           ` Junio C Hamano
2019-06-12  0:37             ` Matthew DeVore
2019-06-12 14:55               ` Matthew DeVore
2019-06-01  0:36 ` [PATCH v2 7/9] list-objects-filter-options: allow mult. --filter Matthew DeVore
2019-06-01  0:36 ` [PATCH v2 8/9] list-objects-filter-options: clean up use of ALLOC_GROW Matthew DeVore
2019-06-03 22:07   ` Jacob Keller
2019-06-03 22:39     ` Matthew DeVore [this message]
2019-06-04  3:16       ` Jacob Keller
2019-06-01  0:36 ` [PATCH v2 9/9] list-objects-filter-options: make parser void Matthew DeVore
2019-06-03 21:35 ` [PATCH v2 0/9] Filter combination Jeff Hostetler
2019-06-13 21:51 ` [PATCH v3 00/10] " Matthew DeVore
2019-06-13 21:51   ` [PATCH v3 01/10] list-objects-filter: make API easier to use Matthew DeVore
2019-06-13 21:51   ` [PATCH v3 02/10] list-objects-filter: put omits set in filter struct Matthew DeVore
2019-06-13 21:51   ` [PATCH v3 03/10] list-objects-filter-options: always supply *errbuf Matthew DeVore
2019-06-13 21:51   ` [PATCH v3 04/10] list-objects-filter: implement composite filters Matthew DeVore
2019-06-13 21:51   ` [PATCH v3 05/10] list-objects-filter-options: move error check up Matthew DeVore
2019-06-13 21:51   ` [PATCH v3 06/10] list-objects-filter-options: make filter_spec a string_list Matthew DeVore
2019-06-13 21:51   ` [PATCH v3 07/10] strbuf: give URL-encoding API a char predicate fn Matthew DeVore
2019-06-13 21:51   ` [PATCH v3 08/10] list-objects-filter-options: allow mult. --filter Matthew DeVore
2019-06-13 21:51   ` [PATCH v3 09/10] list-objects-filter-options: clean up use of ALLOC_GROW Matthew DeVore
2019-06-13 21:51   ` [PATCH v3 10/10] list-objects-filter-options: make parser void Matthew DeVore
2019-06-14 19:50   ` [PATCH v3 00/10] Filter combination Junio C Hamano
2019-06-15  0:40 ` [PATCH v4 " Matthew DeVore
2019-06-15  0:40   ` [PATCH v4 01/10] list-objects-filter: make API easier to use Matthew DeVore
2019-06-21 22:58     ` Jonathan Tan
2019-06-27  0:46       ` Matthew DeVore
2019-06-15  0:40   ` [PATCH v4 02/10] list-objects-filter: put omits set in filter struct Matthew DeVore
2019-06-15  0:40   ` [PATCH v4 03/10] list-objects-filter-options: always supply *errbuf Matthew DeVore
2019-06-15  0:40   ` [PATCH v4 04/10] list-objects-filter: implement composite filters Matthew DeVore
2019-06-18  8:42     ` Johannes Schindelin
2019-06-18 20:22       ` Matthew DeVore
2019-06-21 18:17         ` Johannes Schindelin
2019-06-22  0:26     ` Jonathan Tan
2019-06-27 21:12       ` Matthew DeVore
2019-06-15  0:40   ` [PATCH v4 05/10] list-objects-filter-options: move error check up Matthew DeVore
2019-06-15  0:40   ` [PATCH v4 06/10] list-objects-filter-options: make filter_spec a string_list Matthew DeVore
2019-06-22  0:37     ` Jonathan Tan
2019-06-27 21:17       ` Matthew DeVore
2019-06-15  0:40   ` [PATCH v4 07/10] strbuf: give URL-encoding API a char predicate fn Matthew DeVore
2019-06-15  0:40   ` [PATCH v4 08/10] list-objects-filter-options: allow mult. --filter Matthew DeVore
2019-06-15  0:40   ` [PATCH v4 09/10] list-objects-filter-options: clean up use of ALLOC_GROW Matthew DeVore
2019-06-15  0:40   ` [PATCH v4 10/10] list-objects-filter-options: make parser void Matthew DeVore
2019-06-22  0:46     ` Jonathan Tan
2019-06-27 21:24       ` Matthew DeVore
2019-06-27 22:27         ` Matthew DeVore
2019-06-18  1:25   ` [PATCH v4 00/10] Filter combination Junio C Hamano
2019-06-27 22:54 ` [PATCH v5 " Matthew DeVore
2019-06-27 22:54   ` [PATCH v5 01/10] list-objects-filter: encapsulate filter components Matthew DeVore
2019-06-27 22:54   ` [PATCH v5 02/10] list-objects-filter: put omits set in filter struct Matthew DeVore
2019-06-27 22:54   ` [PATCH v5 03/10] list-objects-filter-options: always supply *errbuf Matthew DeVore
2019-06-27 22:54   ` [PATCH v5 04/10] list-objects-filter: implement composite filters Matthew DeVore
2019-06-27 22:54   ` [PATCH v5 05/10] list-objects-filter-options: move error check up Matthew DeVore
2019-06-27 22:54   ` [PATCH v5 06/10] list-objects-filter-options: make filter_spec a string_list Matthew DeVore
2019-06-27 22:54   ` [PATCH v5 07/10] strbuf: give URL-encoding API a char predicate fn Matthew DeVore
2019-06-27 22:54   ` [PATCH v5 08/10] list-objects-filter-options: allow mult. --filter Matthew DeVore
2019-06-27 22:54   ` [PATCH v5 09/10] list-objects-filter-options: clean up use of ALLOC_GROW Matthew DeVore
2019-06-27 22:54   ` [PATCH v5 10/10] list-objects-filter-options: make parser void Matthew DeVore
2019-06-28 16:05   ` [PATCH v5 00/10] Filter combination Junio C Hamano
2019-06-28 17:16   ` Jonathan Tan

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