Minimal example for Truffle?

[Stefan Fehrenbach]

Hello Truffle folks,

I am working on a very simple language to get acquainted with
Truffle. My ultimate goal is to write a JIT-compiled
parser/grammar interpreter, as I mentioned to Thomas Würthinger
at SPLASH'13.


My question: is there a simple stand-alone example that shows
Truffle/Graal actually doing "its thing"?


In the FAQ it says: "When you run with --vm server, Truffle is
fairly talkative and will tell you when methods are (Truffle)
compiled and when they are deoptimized. If it doesn't tell you
it's compiling anything, then nothing is getting compiled."

When I run my own language [1] it does not print anything.
When I run the "simple language" with one of the test files, it
prints something, but nothing like machine code, see below:

/home/stefan/opt/graalvm-jdk1.8.0/bin/java
-G:+TraceTruffleCompilationDetails -G:TruffleCompilationThreshold=1
-Didea.launcher.port=7532
-Didea.launcher.bin.path=/usr/share/intellijidea-ce/bin
-Dfile.encoding=UTF-8 -classpath
/home/stefan/opt/graalvm-jdk1.8.0/lib/dt.jar:/home/stefan/opt/graalvm-jdk1.8.0/lib/tools.jar:/home/stefan/opt/graalvm-jdk1.8.0/lib/jconsole.jar:/home/stefan/opt/graalvm-jdk1.8.0/lib/sa-jdi.jar:/home/stefan/src/sl/out/production/sl:/home/stefan/src/sl/truffle-0.2.jar:/usr/share/intellijidea-ce/lib/idea_rt.jar
com.intellij.rt.execution.application.AppMain
com.oracle.truffle.sl.SLMain /home/stefan/src/sl/LoopCall.sl
== running on Graal Truffle Runtime
[truffle] opt queued       root add <split>
                |ASTSize      11 (0/0) |C/T          11/    3 |L/T
     11/   11 |Inval#/Replace#     0/    5
[truffle] opt start        root add <split>
                |ASTSize      11 (0/0) |C/T          30/    3 |L/T
     32/   11 |Inval#/Replace#     0/    5
[truffle] opt queued       root add <split>
                |ASTSize      11 (0/0) |C/T          11/    3 |L/T
     11/   11 |Inval#/Replace#     0/    5
[truffle] opt queued       root loop <split>
                |ASTSize      32 (0/0) |C/T           3/    4 |L/T
   2003/ 2013 |Inval#/Replace#     0/   11
1000

Is this all I can expect, and if so, how do I make it compile things
and show me the results?
And is there something I need to do to make Truffle print these
compilation details for my own project or should this just work,
meaning there is something wrong with my use of Truffle in
general?


Anyways, great work. What I have seen of Truffle so far is very
promising and great fun to play with. :)

Best,
Stefan

[1] https://github.com/fehrenbach/tuber-basic
(This currently has some severe issues with frames and variables, but
it runs interpreted.)