Setup first basic polyglot kernel on GraalVM.

[niconomaa]

Using jp-kernel try running polyglot code in GraalVM.

[niconomaa]

@jak-ing please document here

[JakobEdding]

Done with ea2a0ef

Starting node with the right flags --polyglot --jvm is a bit tricky. On the one hand, ijskernel calls node as specified in the Jupyter kernel spec (the flags might not even be necessary here?). But the ijskernel process spawns a new node process; apparently to separate communication with the notebook from execution of code cells. The goal is to have a small executable bash script bin/node which calls the GraalVM node with --polyglot --jvm already set. However, we can't get this to run as of now so I didn't push it either. See steps 1 and 3 for current instructions to get around this issue.

1. In <project_dir>/bin/rc.js, after line 321 add:

            '--polyglot',
            '--jvm',

to start the node communication process with the appropriate flags.

2. Install the pp19-3-jupyter-kernel / ipolyglot node package. Make sure npm and node are pointing to the GraalVM binaries and you have $GRAALVM_HOME/jre/languages/js/bin in your path: npm uninstall ipolyglot -g && jupyter kernelspec remove -f javascript && npm install . -g && ijsinstall [--spec-path=full]

3. The arguments for spawning the 'code execution node process' are set in <project_dir>/node_modules/nel/lib/nel.js. Edit line 202 to look like this: Session._args = ["--polyglot", "--jvm", "--eval", server]; // --eval workaround

4. jupyter-notebook --debug [--no-browser]