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Re: [Libunwind-devel] JIT code registration

From: David Mosberger-Tang
Subject: Re: [Libunwind-devel] JIT code registration
Date: Sun, 30 Oct 2011 10:21:19 -0600

Yes, the dynamic stuff definitely worked on ia64.  I don't remember if it was actually used by some JIT folks or whether we just wanted to be sure that it could work, if a JIT decided to adopt the interface.  In either case, I'm quite sure there are a limited number of users (if any) so tweaking the API sounds fine to me.


On Sun, Oct 30, 2011 at 10:02 AM, Arun Sharma <address@hidden> wrote:
On Sat, Oct 29, 2011 at 8:17 PM, Steve Fink <address@hidden> wrote:
> I am registering custom unwind info for JIT code with
> _U_dyn_register(). All of my JIT code has identical and nearly trivial
> unwind info. There's some complexity in the various trampolines I use
> to enter the JIT code bodies, but those are common code routines
> implemented with inline assembly, and so I already have .cfi
> directives for statically describing those.

This is untested functionality on x86_64 (Ltest-dyn1 fails). I suppose
things worked on ia64 a few years ago.

Getting the basics to work for a JIT might be a good first step before
we can figure out how to make it go fast. Cc: David Mosberger.


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