On 02/27/2017 05:28 PM, Mark Wielaard wrote:
From: Mark Wielaard <m...@klomp.org>
debugedit --base to --dest rewriting of debug source file paths only
supported dest paths that were smaller or equal than the base path
(and the size should differ more than 1 character for correct debug lines).
All paths were changed "in place". Which could in theory mess up debug str
sharing.
This rewrite supports base and dest strings of any size (some limitations,
see below). This is done by reconstructing the debug_str and debug_line
tables and updating the references in the debug_info attributes pointing
to these tables. Plus, if necessary (only for ET_REL kernel modules),
updating any relocations for the debug_info and debug_line sections.
This has the nice benefit of merging any duplicate strings in the
debug_str table which might resulting on slightly smaller files.
kernel modules are ET_REL files that often contain a lot of duplicate
strings.
The rewrite uses elfutils (either libebl or libdw) to reconstruct the
debug_str table. Since we are changing some section sizes now we cannot
just use mmap and rawdata to poke the values, but need to read in and
write out the changed sections. This does take a bit more memory because
we now also need to keep track of all string/line references.
I dont feel qualified to really review this, and perhaps others are
feeling the same way since it's been out there for a week now with no
comments at all.
Because this seems quite awesome (even if also a bit scary), to avoid
stalling forever with no-one to review it: if there are no objections
raised by Monday I'm going to just apply it (and the couple of other
recent debuginfo patches). So anybody having doubts, speak up now.
- Panu -
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