[dwp patch] Add --exec option.

[Cary Coutant <ccoutant at google dot com>]

This patch adds a -e/--exec option to dwp, to fetch the list of .dwo
files from the (linked) executable's debug info. With this option, the
.dwo files don't need to be listed explicitly, and the output file
name defaults to "<exe>.dwp".

Tested on x86_64. OK?

-cary


gold/
        * dwp.cc (File_list): New typedef.
        (Dwo_name_info_reader): New class.
        (Dwo_id_info_reader::Dwo_id_info_reader): Remove unused parameters.
        (Dwo_id_info_reader::visit_top_die): Remove unused member function.
        (Dwo_file::~Dwo_file): Delete input_file_ after obj_.
        (Dwo_file::read_executable): New function.
        (Dwo_file::read): Move common setup code to ...
        (Dwo_file::make_object): ... here.
        (dwp_options): Add --exec/-e.
        (usage): Likewise.
        (main): Likewise.

Attachment: dwp-exec-patch.txt
Description: Text document