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Re: State of JIT compiler


From: leledumbo
Subject: Re: State of JIT compiler
Date: Tue, 22 Feb 2011 19:05:44 -0800 (PST)

> But it's great you're interested in implementing this. Notice I'm replying
on the maintainers' mailing list. What help can we
> offer to get you started?

List of files containing the tree-walker code, that's all for a starting
point. We'll see what I need in the future.

> If I was attacking this project I'd look at the SVN of freemat in
> sourceforge and see what code can be stolen from there.
> Freemat includes a c++ wrapper for llvm to create some classes useful to
> jit the matlab language and then some more code
> for the glue to the parser. We can probably steal the first but would have
> to rewrite the second

Why not? Is FreeMat's license incompatible with Octave or what?

> Almost all of the previous discussion has been focused on going the LLVM
> route; that is, tackling the monster that is static
> type inference.  However, a couple of the threads touch on a newer method
> without actually giving the name: tracing JIT (or
> trace-based JIT).  As far as I understand it, the idea is to allow the
> interpreter to run as normal until it finds a block of code
> that is run multiple times on the same path, compiling that chunk, and
> using that to speed up execution.  When it exits the
> block -- whether it's the end of the loop or just a conditional jump that
> doesn't usually occur -- it goes back to the interpreter.
> No type inference would be needed because the interpreter would *tell* the
> compiler what the types are.

Hmm...I never heard of trace-based JIT, but instead of half-JIT like this,
I'd rather choose full JIT.
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