[Mesa-dev] [PATCH 2/2] gallium/util: libunwind support

[Rob Clark]

On Mon, Apr 3, 2017 at 12:56 PM, Thomas Hellstrom <thellstrom at vmware.com> wrote:
> Hi, Rob,
>
> On 03/24/2017 10:21 PM, Rob Clark wrote:
>> It's kinda sad that (a) we don't have debug_backtrace support on !X86
>> and that (b) we re-invent our own crude backtrace support in the first
>> place.  If available, use libunwind instead.  The backtrace format is
>> based on what xserver and weston use, since it is nice not to have to
>> figure out a different format.
>>
>> Signed-off-by: Rob Clark <robdclark at gmail.com>
>
> Did you consider glibc "backtrace()", I think it's also available on ARM...

I had not.. although xserver and weston are already using libunwind.
I'm not sure about portability of libunwind to other libc
implementations (but I guess it is at least not worse than using a
glibc specific API).

I suppose we could always add a fallback to backtrace().

> Also is the output format the same as before, or at least compatible with
> gallium/tools/addr2line.sh?

quite possibly not.. I chose to align to the format that xserver and
weston was already using.  Otoh, not sure if you would need to use
addr2line.sh since it already decodes things to human readable
fxn/file names.

BR,
-R

> Thanks,
> Thomas
>