[Bug] Xmx not passed to script JVM

[skirge]

Describe the bug

-J-Xmx flag is not passed to JVM which is running script

To Reproduce
Steps to reproduce the behavior:

1. invoke joern with -J-Xmx24G --script somescript.sc
2. run ps and notice that java process running replpp.scripting.NonForkingScriptRunner is missing -Xmx flag provided on command line

I think that ScriptRunning.exec is not passing additional JVM command line arguments to created java process.
As a result analysis crashes with OutOfMemory error despite providing flag on command line to increase heap to maximum.

Expected behavior
Xmx flag should be passed to jvm running the script

[LPirch]

Hello, same problem here. This is my script (script.sc):

@main def exec() = {
  System.out.println(Runtime.getRuntime().maxMemory())
  System.out.println(Runtime.getRuntime().availableProcessors())
}

Normal Behavior in Joern Shell

1. joern -J-Xmx12G -J-XX:ActiveProcessorCount=3
2. joern> System.out.println(Runtime.getRuntime().maxMemory()) prints "12884901888" (12GB)
3. joern> System.out.println(Runtime.getRuntime().availableProcessors()) prints "3"

Bugged Behavior in Script

1. joern -J-Xmx12G -J-XX:ActiveProcessorCount=3 --script script.sc
2. prints the full amount available on my machine

The same applies if called with JAVA_OPTS in both cases.

[LPirch]

For anyone who stumbles across this: Here is my current workaround.

script.sc:

def foo(m: Method) = m.ast.size

def main(argA: String) = {
    cpg.method.map(foo).sum

    System.out.println(Runtime.getRuntime().maxMemory())
    System.out.println(Runtime.getRuntime().availableProcessors())
    System.out.println(argA)
}

run_script.sh:

#!/usr/bin/env bash

set -eu

MAX_MEMORY="40G"
MAX_CORES=32

if [ $# -lt 4 ]; then
    echo "Usage: $0 <cpg_file> <script_file> <args>"
    exit 1
fi

cpg_file=$1; shift
script_file=$1; shift
args=$(IFS=, ; echo "$*")
echo -e "main($args)" | joern -J-Xmx$MAX_MEMORY -J-XX:ActiveProcessorCount=$MAX_CORES $cpg_file --import $script_file