[MLton] C-- backend
John Dias
dias@eecs.harvard.edu
Mon, 3 Jul 2006 19:18:38 -0400 (EDT)
Well, to be more precise, qc-- supports multiple stacks, but it does not
yet detect overflow.
-j
On Mon, 3 Jul 2006, Matthew Fluet wrote:
>
>> I was recently told that a C-- backend for MLton exists, but the newest
>> information I could find was from March of 2005.
>
> That is the most recent info in the mailing list. I made a couple more
> modifications to the backend in Summer 2005, when one of Norman Ramsey's
> summer undergrad students was thinking about more efficient representations
> of span data.
>
>> Targetting C-- would be pretty handy for us, because some of the
>> optimizations involve weak continuations. However, the last thing I read
>> on the backend said that it still hasn't implemented callcc (among other
>> features), so that might make things more difficult.
>
> Correct; the qc-- compiler doesn't currently support multiple stacks. Since,
> to use C-- effectively, we aren't using the same trampoline as is used in the
> C backend, there needs to be a C-- stack for every ML stack.
>
> A grad student was working on getting C-- and qc-- to support multiple
> stacks, but I don't believe that they have been fully integrated yet. And
> they certainly haven't been pushed into the C-- backend.
>
>> I wanted to know what the current state of the C-- backend is, and if/where
>> we could get the source code.
>
> The state is pretty much what was documented in the March 2005 emails.
> (Modulo some bugs fixed in the qc-- compiler.) It is still very
> experimental, but you're welcome to check it out. It is available in SVN at:
> svn://mlton.org/svnroot/mlton/branches/on-20050420-cmm-branch
>
> IIRC, in order to compile with qc-- using the C-- backend, you'll need to
> copy the lib/qc-- files from the qc-- install directory to build/lib/self in
> the mlton build.
>
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