Java truffle native image

[mmcgill]

This PR addresses #568, fixing issues that prevented the compilation of GraalVM native images
for the java-truffle Mal implementation.

In addition, a make-native.sh convenience script has been provided for those who wish to try building native images themselves. I have not changed the Makefile or run script to use native images, as each step takes almost a minute to build on my machine. There may also be some stability issues with the AOT compilation process; out ~40 compilation attempts, I had 2 SIGSEGV crashes that were not repeatable.

[wasamasa]

Sorry for the stupid question, but since when are step B to E a thing?

[mmcgill]

Sorry for the stupid question, but since when are step B to E a thing?

They're totally not :) I was trying to stick with Mal's pedagogical approach, and add some Truffle-specific optimizations in stepwise fashion so that readers could follow along. Hopefully I haven't muddled things too much in the process.

[borkdude]

@mmcgill I am trying this out locally. When running gradle build I get:

$ gradle build

> Configure project :
/private/tmp/mal/impls/java-truffle/build/classes/java/main:/private/tmp/mal/impls/java-truffle/build/resources/main:/Users/borkdude/.m2/repository/org/graalvm/truffle/truffle-api/21.1.0/truffle-api-21.1.0.jar:/Users/borkdude/.gradle/caches/modules-2/files-2.1/org.organicdesign/Paguro/3.2.0/c437a15a2eb0a1f3efbdbf995c7ee8c988201963/Paguro-3.2.0.jar

> Task :compileJava FAILED
/private/tmp/mal/impls/java-truffle/src/main/java/truffle/mal/step3_env.java:9: error: package org.graalvm.polyglot does not exist
import org.graalvm.polyglot.Context;

followed by lots of other similar errors. What should I do to fix this?

EDIT: never mind, got it working when setting:

export JAVA_HOME=$GRAALVM_HOME

[borkdude]

Confirming the native image works on my machine too!

[mmcgill]

Confirming the native image works on my machine too!

\o/ Thanks for checking :D

@mmcgill I am trying this out locally. When running gradle build I get:

$ gradle build

> Configure project :
/private/tmp/mal/impls/java-truffle/build/classes/java/main:/private/tmp/mal/impls/java-truffle/build/resources/main:/Users/borkdude/.m2/repository/org/graalvm/truffle/truffle-api/21.1.0/truffle-api-21.1.0.jar:/Users/borkdude/.gradle/caches/modules-2/files-2.1/org.organicdesign/Paguro/3.2.0/c437a15a2eb0a1f3efbdbf995c7ee8c988201963/Paguro-3.2.0.jar

> Task :compileJava FAILED
/private/tmp/mal/impls/java-truffle/src/main/java/truffle/mal/step3_env.java:9: error: package org.graalvm.polyglot does not exist
import org.graalvm.polyglot.Context;

followed by lots of other similar errors. What should I do to fix this?

Apologies, I didn't think through the implications of excluding the graal-sdk dependency of truffle-api, which is there specifically to ensure compilation on JDKs other than Graal. I added that as a hack to work around classpath issues in Eclipse after importing the Gradle project, There's almost certainly a more correct way to accomplish the goal, so I'll remove the exclusion.

[kanaka]

Finally getting around to merging this. Thanks @mmcgill @borkdude for getting to the bottom of this!