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Re: [PATCH][SPARC] sparc: switch -fasynchronous-unwind-tables on by default.
- From: jose dot marchesi at oracle dot com (Jose E. Marchesi)
- To: Richard Henderson <rth at redhat dot com>
- Cc: Eric Botcazou <ebotcazou at adacore dot com>, gcc-patches at gcc dot gnu dot org
- Date: Thu, 17 Mar 2016 17:41:23 -0700
- Subject: Re: [PATCH][SPARC] sparc: switch -fasynchronous-unwind-tables on by default.
- Authentication-results: sourceware.org; auth=none
- References: <1456435447-23676-1-git-send-email-jose dot marchesi at oracle dot com> <10333302 dot PFiANu1Ugm at polaris> <87h9grcy85 dot fsf at oracle dot com> <56EB1E4D dot 4050505 at redhat dot com>
> The backtrace(3) implementation for sparc contains a simple unwinder
> that works well in most cases, but that unwinder is not used if
> libgcc_s.so can be dlopened and it provides _Unwind_Backtrace.
There's no reason that simple unwinder can't be put into
MD_FALLBACK_FRAME_STATE_FOR.
Currently we only use that for unwinding through signal stacks, but it could be
used for anything that the dwarf2 unwinder doesn't have data for. Given sparc
register windows, this seems particularly reliable.
Sounds like a good idea. Let me prepare a patch for that...