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In-Reply-To: <CAG3jReJOfkwOpymMkM8cXr1K2u8MC3sO=qxkd9AwP_qMfQ-fvw@mail.gmail.com>
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Date: Wed, 20 May 2015 15:13:00 -0000
Message-ID: <CAG3jReJLbimwj4uasT7Bd48izBUii3_oLjOezEVYN060uYde3w@mail.gmail.com>
Subject: Re: [patch][gold] Change how we compute merge mapping for strings
From: =?UTF-8?Q?Rafael_Esp=C3=ADndola?= <rafael.espindola@gmail.com>
To: Binutils <binutils@sourceware.org>
Cc: Cary Coutant <ccoutant@gmail.com>
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Now with the correct email address. Sorry about that.

On 20 May 2015 at 11:12, Rafael Esp=C3=ADndola <rafael.espindola@gmail.com>=
 wrote:
> Currently we first record the offset and hash of each string. We then
> walk that computing the size from the difference in the offsets.
>
> This doesn't work if not every string is kept, which is what I am
> trying to do (gc unused parts of SHF_MERGE sections).
>
> With the attached patch we first add a mapping that is missing the
> output offset and once the strings are merged we just set the output
> offset.
>
> Cheers,
> Rafael
>
> 2015-05-20  Rafael =C3=81vila de Esp=C3=ADndola <rafael.espindola@gmail.c=
om>
>
> * merge.cc (do_add_input_section): Create mappings with no output
> offset.
> (finalize_merged_data): Set the output offsets.
> * merge.h (Merged_string): Delete.