Demonstrating the tooling and polyglot capabilities of GraalVM. Showing how to apply Insights over Ruby and JavaScript programs. Demonstrating usage of a dedicated "debug" language to specify watchpoints easily. Using Chrome DevTools to replay the recorded execution.
Build the debug language with Maven and register it into GraalVM:
debuglang$ mvn clean install
debuglang$ mkdir $GRAALVM/jre/languages/debuglang/
debuglang$ cp $HOME/.m2/repository/org/graalvm/tools/debuglang/1.0-SNAPSHOT/debuglang-1.0-SNAPSHOT.jar $GRAALVM/jre/languages/debuglang/then you shall be able to use the language to trace computations of your program:
$ cat >watchpoints.dbg
at some.js:3 watch x
at some.js:8 watch y watch z
$ $GRAALVM/bin/js --jvm --polyglot --insight=watchpoints.dbg some.jsYou can copy the traces into a dedicated file log.dbg and replay them in Chrome DevTools:
$ GRAALVM/bin/polyglot --inspect --jvm log.dbgEnjoy!