Erjang - a JVM-based Erlang VM

  Wiki Pages: www.erjang.org
  Discussion: http://groups.google.com/group/erjang
  Source: http://github.com/krestenkrab/erjang

--

BUILDING


You should be able to do "ant jar", and thereafter run the sample
with 

  prompt% ant jar
  ...
  prompt% ./ring_test.sh 
  ...
  loading io
  loading timer
  loading ring
  loading erlang
  io:format "~p Starting message~n" [{1259,922511,63000}]
  io:format "~p Around ring ~p times ~n" [{1259,922512,434000},10000]
  io:format "~p Around ring ~p times ~n" [{1259,922513,600000},20000]
  io:format "~p Around ring ~p times ~n" [{1259,922514,763000},30000]
  io:format "~p Around ring ~p times ~n" [{1259,922515,930000},40000]
  io:format "~p Around ring ~p times ~n" [{1259,922517,117000},50000]
  ....

The source for the few samples are in src/main/erl.

--

RUNNING

When running, it writes files named ".erj/module-${CRC}.jar".  These
files are written in response to erlang:compile_module(Module,Binary).

These files also serve as a cache of files translated from beam -> jar.
If something goes astray, it may help to remove the .erj directory
forcing Erjang to recompile next time it runs.

--

PREREQUISITES

I have only been testing this with Erlang/OTP R13B02.

While we are still bootstrapping, the compiler uses a remote
erlang process to parse beam files (using beam_disasm), so you 
need to have this running:

  prompt% cd src/main/erl
  prompt% erl -sname beam_loader@localhost -s beam_loader

Otherwise you will get errors like this:

Exception in thread "main" java.lang.Error: java.io.IOException: Cannot connect to peer node
	at erjang.beam.Compiler.<clinit>(Compiler.java:55)
	at erjang.EModule.load_module(EModule.java:429)
	at erjang.Erj.main(Erj.java:61)

Eventually this will obviously be self-hosted in Erjang.


To run the tests, you need an OTP distribution, and go edit src/test/java/erjang/TestAll.java
to tell it where your OTP_HOME is.



Cheers!

Kresten Krab Thorup
krab _at_ trifork dot com