From: Pedro Alves <palves@redhat.com>
To: Tom Tromey <tom@tromey.com>, gdb-patches@sourceware.org
Subject: Re: [RFA 01/12] Introduce a gdb_ref_ptr specialization for struct value
Date: Fri, 06 Apr 2018 19:29:00 -0000 [thread overview]
Message-ID: <6e1fc69d-daf7-1fe6-5fbb-5ea3748e1787@redhat.com> (raw)
In-Reply-To: <20180405211507.6103-2-tom@tromey.com>
On 04/05/2018 10:14 PM, Tom Tromey wrote:
> struct value is internally reference counted and so, while it also has
> some ownership rules unique to it, it makes sense to use a gdb_ref_ptr
> when managing it automatically.
>
> This patch removes the existing unique_ptr specialization in favor of
> a reference-counted pointer. It also introduces two other
> clarifications:
>
> 1. Rename value_free to value_decref, which I think is more in line
> with what the function actually does; and
>
> 2. Change release_value to return a gdb_ref_ptr. This change allows
> us to remove the confusing release_value_or_incref function,
> primarily by making it much simpler to reason about the result of
> release_value.
Yeah. As I was reading this patch, I was wondering whether
release_value is going to score high in could-use-a-better-name
charts. I.e., wondering whether code like this:
release_value (v).release ();
is likely to cause confusion.
Maybe renaming it to be a bit more explicit would help.
E.g.:
release_from_value_chain (v).release ();
or:
move_out_of_value_chain (v).release ();
But, the following patches eliminate the ".release()" calls, so
it isn't that bad. Anyway, that was a thought for another rainy
day, not for this patch.
Thanks,
Pedro Alves
next prev parent reply other threads:[~2018-04-06 19:29 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-05 21:16 [RFA 00/12] (somewhat) clean up struct value ownership Tom Tromey
2018-04-05 21:16 ` [RFA 02/12] Change breakpoints to use value_ref_ptr Tom Tromey
2018-04-06 19:31 ` Pedro Alves
2018-04-06 21:31 ` Tom Tromey
2018-04-05 21:16 ` [RFA 07/12] Remove free_value_chain Tom Tromey
2018-04-05 21:16 ` [RFA 11/12] Remove range_s VEC Tom Tromey
2018-04-05 21:16 ` [RFA 03/12] Change last_examine_value to value_ref_ptr Tom Tromey
2018-04-05 21:16 ` [RFA 09/12] Use new and delete for values Tom Tromey
2018-04-05 21:16 ` [RFA 05/12] Change value history to use value_ref_ptr Tom Tromey
2018-04-05 21:16 ` [RFA 01/12] Introduce a gdb_ref_ptr specialization for struct value Tom Tromey
2018-04-06 19:29 ` Pedro Alves [this message]
2018-04-05 21:16 ` [RFA 12/12] Change value::contents to be a unique_xmalloc_ptr Tom Tromey
2018-04-05 21:16 ` [RFA 04/12] Change varobj to use value_ref_ptr Tom Tromey
2018-04-05 21:16 ` [RFA 06/12] Remove free_all_values Tom Tromey
2018-04-05 21:16 ` [RFA 10/12] Change value::parent to a value_ref_ptr Tom Tromey
2018-04-05 21:16 ` [RFA 08/12] Remove value::next and value::released Tom Tromey
2018-04-06 19:32 ` Pedro Alves
2018-04-06 21:40 ` Tom Tromey
2018-04-06 19:33 ` [RFA 00/12] (somewhat) clean up struct value ownership Pedro Alves
2018-04-06 21:20 ` Tom Tromey
2018-04-06 21:44 ` Tom Tromey
2018-04-08 21:32 ` Tom Tromey
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