From: Sergio Durigan Junior <sergiodj@redhat.com>
To: Pedro Alves <palves@redhat.com>
Cc: Simon Marchi <simon.marchi@ericsson.com>,
GDB Patches <gdb-patches@sourceware.org>,
Tom Tromey <tom@tromey.com>, Eli Zaretskii <eliz@gnu.org>
Subject: Re: [PATCH v2] Implement pahole-like 'ptype /o' option
Date: Mon, 11 Dec 2017 22:50:00 -0000 [thread overview]
Message-ID: <87fu8gdgl8.fsf@redhat.com> (raw)
In-Reply-To: <964bae42-6e60-4e9d-048c-ef570c1d3a5b@redhat.com> (Pedro Alves's message of "Mon, 11 Dec 2017 22:42:22 +0000")
On Monday, December 11 2017, Pedro Alves wrote:
> On 12/11/2017 09:07 PM, Sergio Durigan Junior wrote:
>
>>>> This is actually on purpose. If I indent the line, it will have more
>>>> than 80 chars. I believe this is a well known method for avoiding this
>>>> problem...?
>>>
>>> I am not aware of that. In this case I would put the parameter list on the next,
>>> I'm not sure if it's 100% GNU-style approved, but nobody complained when I did it
>>> so far :)
>>>
>>> static void
>>> print_spaces_filtered_with_print_options
>>> (int level, struct ui_file *stream, const struct type_print_options *flags);
>>>
>>> It helps with long function names. In this case, I would probably just drop the
>>> "struct" to save a few chars, because C++.
>>
>> Fair enough. I use this trick for function prototypes, but not for the
>> definitions.
>
> Simon's format is what I've been using for a long while too.
Well, I could post a few examples of the format I chose, but I'm pretty
sure this would be worthless. As I said, I will change my code.
>>> But I don't mind it, it just stuck out as a little inconsistency.
>>
>> I don't see the inconsistency.
>>
>> If a field is inside a struct, it has its offset *and* size printed. No
>> matter if the field is an int, another struct, or an union.
>>
>> If a field is inside an union, it has only its size printed.
>>
>> In the case above, it makes sense to have the offsets printed for the
>> fields inside the two structs (inside the union), because there might be
>> holes to report (well, one can argue that it doesn't matter if there are
>> holes or not in this case, because if the other struct is bigger then
>> the union size will stay the same). However, it doesn't make sense to
>> print the offsets for the two structs themselves, because they are
>> members of the union.
>>
>> I hope it makes more sense now.
>
> But why do we need the special case? Does it help anything?
> So far, it seems it only added confusion.
What do you mean by "special case"?
This is what pahole does, and as I've said a few times, the output of
'ptype /o' has been based on pahole's output. I don't consider this a
special case; I consider it to be the natural thing to do, because
offsets don't make much sense in unions.
> The option is "/o" for "print offsets". Why not print offsets always?
I hope I explained it above.
> BTW, shouldn't the documentation in the manual include an example
> of GDB's output?
I can include an example, OK.
--
Sergio
GPG key ID: 237A 54B1 0287 28BF 00EF 31F4 D0EB 7628 65FC 5E36
Please send encrypted e-mail if possible
http://sergiodj.net/
next prev parent reply other threads:[~2017-12-11 22:50 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-21 16:07 [PATCH] " Sergio Durigan Junior
2017-11-21 16:16 ` Sergio Durigan Junior
2017-11-21 16:50 ` Eli Zaretskii
2017-11-21 17:00 ` Sergio Durigan Junior
2017-11-21 19:14 ` Eli Zaretskii
2017-11-26 19:27 ` Tom Tromey
2017-11-27 19:54 ` Sergio Durigan Junior
2017-11-27 22:20 ` Tom Tromey
2017-11-28 0:39 ` Sergio Durigan Junior
2017-11-28 21:21 ` [PATCH v2] " Sergio Durigan Junior
2017-11-29 3:28 ` Eli Zaretskii
2017-12-04 15:03 ` Sergio Durigan Junior
2017-12-04 15:41 ` Eli Zaretskii
2017-12-04 16:47 ` Sergio Durigan Junior
2017-12-08 21:32 ` Sergio Durigan Junior
2017-12-11 15:43 ` Simon Marchi
2017-12-11 18:59 ` Sergio Durigan Junior
2017-12-11 20:45 ` Simon Marchi
2017-12-11 21:07 ` Sergio Durigan Junior
2017-12-11 22:42 ` Pedro Alves
2017-12-11 22:50 ` Sergio Durigan Junior [this message]
2017-12-11 23:46 ` Pedro Alves
2017-12-12 0:25 ` Sergio Durigan Junior
2017-12-12 0:52 ` Pedro Alves
2017-12-12 1:25 ` Simon Marchi
2017-12-12 15:50 ` John Baldwin
2017-12-12 17:04 ` Sergio Durigan Junior
2017-12-11 19:58 ` [PATCH v3 0/2] Implement pahole-like 'ptype /o' option (and do some code reorg) Sergio Durigan Junior
2017-12-11 19:58 ` [PATCH v3 2/2] Implement pahole-like 'ptype /o' option Sergio Durigan Junior
2017-12-11 21:50 ` Simon Marchi
2017-12-11 23:24 ` Sergio Durigan Junior
2017-12-12 1:32 ` Simon Marchi
2017-12-12 6:19 ` Sergio Durigan Junior
2017-12-12 18:14 ` Pedro Alves
2017-12-12 18:40 ` Sergio Durigan Junior
2017-12-12 20:12 ` Pedro Alves
2017-12-11 19:58 ` [PATCH v3 1/2] Reorganize code to handle TYPE_CODE_{STRUCT,UNION} on 'c_type_print_base' Sergio Durigan Junior
2017-12-11 20:55 ` Simon Marchi
2017-12-11 23:05 ` Sergio Durigan Junior
2017-12-11 23:43 ` [PATCH v4 0/2] Implement pahole-like 'ptype /o' option (and do some code reorg) Sergio Durigan Junior
2017-12-11 23:44 ` [PATCH v4 1/2] Reorganize code to handle TYPE_CODE_{STRUCT,UNION} on 'c_type_print_base' Sergio Durigan Junior
2017-12-11 23:44 ` [PATCH v4 2/2] Implement pahole-like 'ptype /o' option Sergio Durigan Junior
2017-12-12 0:27 ` Sergio Durigan Junior
2017-12-12 0:29 ` Sergio Durigan Junior
2017-12-12 1:59 ` Simon Marchi
2017-12-12 3:39 ` Eli Zaretskii
2017-12-13 3:17 ` [PATCH v5 0/2] Implement pahole-like 'ptype /o' option (and do some code reorg) Sergio Durigan Junior
2017-12-13 3:17 ` [PATCH v5 2/2] Implement pahole-like 'ptype /o' option Sergio Durigan Junior
2017-12-13 4:50 ` Simon Marchi
2017-12-13 16:42 ` Sergio Durigan Junior
2017-12-13 16:17 ` Eli Zaretskii
2017-12-13 17:14 ` Sergio Durigan Junior
2017-12-13 16:19 ` Pedro Alves
2017-12-13 17:13 ` Sergio Durigan Junior
2017-12-13 20:36 ` Sergio Durigan Junior
2017-12-13 21:22 ` Pedro Alves
2017-12-13 21:30 ` Pedro Alves
2017-12-13 21:34 ` Sergio Durigan Junior
2017-12-13 16:20 ` Pedro Alves
2017-12-13 17:41 ` Sergio Durigan Junior
2017-12-13 3:17 ` [PATCH v5 1/2] Reorganize code to handle TYPE_CODE_{STRUCT,UNION} on 'c_type_print_base' Sergio Durigan Junior
2017-12-14 2:48 ` [PATCH v6 0/2] Implement pahole-like 'ptype /o' option (and do some code reorg) Sergio Durigan Junior
2017-12-14 2:48 ` [PATCH v6 1/2] Reorganize code to handle TYPE_CODE_{STRUCT,UNION} on 'c_type_print_base' Sergio Durigan Junior
2017-12-14 2:48 ` [PATCH v6 2/2] Implement pahole-like 'ptype /o' option Sergio Durigan Junior
2017-12-14 14:19 ` Pedro Alves
2017-12-14 20:31 ` Sergio Durigan Junior
2017-12-14 14:50 ` Pedro Alves
2017-12-14 20:29 ` Sergio Durigan Junior
2017-12-14 16:30 ` Eli Zaretskii
2017-12-15 1:12 ` [PATCH v7 0/2] Implement pahole-like 'ptype /o' option (and do some code reorg) Sergio Durigan Junior
2017-12-15 1:12 ` [PATCH v7 1/2] Reorganize code to handle TYPE_CODE_{STRUCT,UNION} on 'c_type_print_base' Sergio Durigan Junior
2017-12-15 1:13 ` [PATCH v7 2/2] Implement pahole-like 'ptype /o' option Sergio Durigan Junior
2017-12-15 17:24 ` Pedro Alves
2017-12-15 20:04 ` Sergio Durigan Junior
2017-12-15 20:11 ` [PATCH v7 0/2] Implement pahole-like 'ptype /o' option (and do some code reorg) Sergio Durigan Junior
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