MateVM is a Java JIT compiler written in Haskell, using already existing libaries, namly Harpy and hs-java.
MateVM is i686 (i.e. 32-Bit) only at the moment.
Visit us at #MateVM on OFTC!
We use hs-java to parse Java Classfiles in order to get a Java Bytecode
representation. Afterwards we perform a basic-block analysis and generate a
control-flow-graph (CFG). We apply several program-analyses, transformations
and optimizations. Given the annotated CFG we emit native code for a method with
Harpy (i686) in an on demand manner.
At the moment we try to minimize effort, by focusing on essential features of the JVM, for example there is no support for threads yet.
Install GHC via your distro manager. Make sure you install it with shared libaries. On Ubuntu 12.04 LTS that is:
$ sudo apt-get install ghc-dynamic ghc-prof \
cabal-install libzip-dev libgc-dev
For an easy installation of the remaining packages, you can use
the script ./tools/installhaskellenv.sh.
PLEASE NOTE: it deletes your ~/.cabal and ~/.ghc directory first in
order to get a fresh cabal install!
Build the mate executable with (building with cabal isn't supported yet)
$ make
it also builds a simple base library for the Java Runtime, so be sure javac is
in your $PATH.
There are some working examples in ./tests/, you can execute
one with the given Makefile; assume you want to execute ./tests/Fib.java:
$ make tests/Fib
or without the Makefile
$ javac tests/Fib.java
$ ./mate tests.Fib
you can compare the output with your Java JVM (java in your $PATH) with:
$ make tests/Fib.test
we also have a build bot which
checks for broken cabal dependencies every night, and it also checks the build
with make tests.
Unfortunately, we can't use GNU Classpath yet, but we're working on it, so stay tuned!