[pythran] Fwd: [LLVMdev] Pyston: a Python JIT on LLVM
- From: Mehdi AMINI <mehdi.amini@xxxxxxxxxx>
- To: pythran@xxxxxxxxxxxxx
- Date: Tue, 08 Apr 2014 16:32:19 -0700
Yet another Python Compiler
-------- Original Message --------
Subject: [LLVMdev] Pyston: a Python JIT on LLVM
Date: Thu, 3 Apr 2014 11:10:39 -0700
From: Kevin Modzelewski <kmod@xxxxxxxxxxx>
To: Dev <llvmdev@xxxxxxxxxxx>
Hi all,
I've been lurking on the list for a bit, and I'm excited to finally talk
about what I'm working on: Pyston, a JIT for Python
<https://tech.dropbox.com/2014/04/introducing-pyston-an-upcoming-jit-based-python-implementation/>.
It's still extremely early on, but I'm happy that I can open source
the code <https://github.com/dropbox/pyston> for viewing and discussion.
It contains experimental but working implementations of a few things
that I thought might be interesting to the community; they are certainly
not production-quality implementations, but I hope they can be at least
a data point for people interested in the functionality:
- It contains a working cross-module inliner
<https://github.com/dropbox/pyston/blob/master/src/codegen/opt/inliner.cpp>,
which can be necessary for doing inlining with MCJIT.
- It has a build system that allows compiling a runtime file both into
the JIT itself, as well as into the stdlib bitcode file for inlining
into JIT'd code.
- It contains a working inline cache system that uses the
llvm.experimental.patchpoint() intrinsic. It also has some new support
for using the PreserveAll calling convention so that the inline cache
fastpaths can often avoid spilling registers.
- It has a few optimization passes that are optimized for Pyston, but
could be applicable to other dynamic languages; in particular it has an
escape analysis for GC'd memory
<https://github.com/dropbox/pyston/blob/master/src/codegen/opt/escape_analysis.cpp>
that helps lower GC'd memory to registers if the variable is local
(something that is probably rare in static languages, but very common in
Python).
- Some perf debugging tools, ex for getting instruction-level profiles
of JIT'd code.
There's still a very, very long way to go for Pyston, but it couldn't
have even started without LLVM, so I hope I can give something back!
kmod
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