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Debugger in NetBeans 8.1

NetBeans 8.1 and newer ships with support for debugging of Truffle languages. Here is a promotional video demonstrating how to use such feature, but you can try that too! Just get the most recent build of NetBeans, install the Truffle Debugging Support module and get the sources:

Installing Maven Bits and Working with Sources

Assuming your GraalVM is installed in directory $GRAAL_VM, continue by installing essential Truffle binaries into your local Maven repository:

$ $GRAAL_VM/bin/maven_install_graalvm

and then you can work with the sources. First of all obtain them and switch to the correct (known to work at present time) revision:

$ hg clone http://source.apidesign.org/hg/truffledebugdemo/
$ cd truffledebugdemo
$ hg up -C GraalVM-0.9

With the sources you can now use the command line or the IDE to work with them:

# compile:
$ JAVA_HOME=$GRAAL_VM mvn clean install
# execute
$ JAVA_HOME=$GRAAL_VM mvn exec:exec
factorial(5) = 120

The sample prints out value of factorial for five computed in four different (Java, Ruby, JavaScript and our testing simple language) languages.

Debugging from NetBeans

Make sure NetBeans is running on the GraalVM:

$ /netbeans8.1/bin/netbeans --jdkhome $GRAAL_VM

Open the project sources in the IDE (File/Open Project, select the truffledebugdemo directory). Open MixLanguages.java source file. Put breakpoint to MixLanguages.java line 37 that invokes the global factorial symbol and debug the project (Debug/Debug Project or press Ctrl-F5). Once the breakpoint is hit, you can step-into (F7), you'll be in JavaScript. If you continue stepping in you'll get into simple language and then also into Ruby. Values of local variables will be available. Enjoy:

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