Re: [ANN] LuaJIT-2.0.0-rc1
- From: Mike Pall <mike-1211@xxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Thu, 1 Nov 2012 00:31:19 +0100
Florian Weimer wrote:
> Regarding commit 1d5c2ce4e295562daddfe6ce8e470749f0d42542, another
> source of callbacks into compiled are error callbacks (which are
> invoked only rarely). Perhaps it might make sense to mention this
> case as well?
I'll add that to the docs for 2.0.1.
> Do you plan to fix this eventually? It's a bit scary. Any fix seems
> to require to save the stack pointer and possibly a pointer to the
> side exit in the Lua state on every C call, which introduces
> additional overhead. 8-(
You'll need the non-volatile register contents, too. And these are
hard to retrieve. The x64 unwinder doesn't like the frame for the
JIT-compiled code. And on non-x64 platforms there's no unwind
information.
I don't think there's a good solution to this problem. "Avoid
callbacks from C" is the well-worn advice I can offer.
--Mike
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