jperl

#!/bin/bash
#
# PerlOnJava Launcher Script
# This script launches the PerlOnJava runtime environment, which provides
# a Java-based implementation of the Perl programming language.
# Repository: github.com/fglock/PerlOnJava
#

# Get the directory where this script is located without depending on the
# external dirname utility. CPAN build tools can intentionally replace PATH
# with prerequisite script directories before launching a nested $^X.
SCRIPT_SOURCE="${BASH_SOURCE[0]}"
case "$SCRIPT_SOURCE" in
    */*) SCRIPT_PARENT="${SCRIPT_SOURCE%/*}" ;;
    *)   SCRIPT_PARENT="." ;;
esac
SCRIPT_DIR="$(cd "$SCRIPT_PARENT" && pwd -P)"

# Get the full path to this script to set $^X correctly
JPERL_PATH="$(readlink -f "${BASH_SOURCE[0]}" 2>/dev/null || echo "$SCRIPT_DIR/jperl")"

# Export environment variable for PerlOnJava to use as $^X
export PERLONJAVA_EXECUTABLE="$JPERL_PATH"

# Java 24 virtual threads are the default Perl ithread carrier. Preserve an
# explicit environment selection; the equivalent JVM property in JPERL_OPTS
# still takes precedence inside PerlThreadExecutionPolicy.
if [ -z "${JPERL_THREAD_MODE+x}" ]; then
    export JPERL_THREAD_MODE=virtual
fi

# An acceptance run may bind the launcher to one exact standalone artifact.
# Reject an empty or missing override rather than silently falling back.
if [ -n "${PERLONJAVA_JAR+x}" ]; then
    if [ ! -f "$PERLONJAVA_JAR" ] || [ ! -s "$PERLONJAVA_JAR" ]; then
        echo "ERROR: PERLONJAVA_JAR must name an existing nonempty JAR: $PERLONJAVA_JAR" >&2
        exit 1
    fi
    PERLONJAVA_CP="$PERLONJAVA_JAR"
# Check development environment first (target directory). During Maven's test
# phase the packaged JAR does not exist yet, so use compiled classes plus the
# runtime dependency classpath generated by maven-dependency-plugin.
elif [ -f "$SCRIPT_DIR/target/perlonjava-5.44.1.jar" ]; then
    PERLONJAVA_CP="$SCRIPT_DIR/target/perlonjava-5.44.1.jar"
elif [ -d "$SCRIPT_DIR/target/classes" ] && [ -f "$SCRIPT_DIR/target/jperl-test-classpath.txt" ]; then
    MAVEN_RUNTIME_CP=$(tr -d '\r\n' < "$SCRIPT_DIR/target/jperl-test-classpath.txt")
    PERLONJAVA_CP="$SCRIPT_DIR/target/classes"
    if [ -n "$MAVEN_RUNTIME_CP" ]; then
        PERLONJAVA_CP="$PERLONJAVA_CP:$MAVEN_RUNTIME_CP"
    fi
elif [ -f "$SCRIPT_DIR/perlonjava-5.44.1.jar" ]; then
    # Docker or local installation with jar in same directory
    PERLONJAVA_CP="$SCRIPT_DIR/perlonjava-5.44.1.jar"
else
    # Use installed package path (when installed via deb package)
    PERLONJAVA_CP="$SCRIPT_DIR/../lib/perlonjava-5.44.1.jar"
fi

# Determine JVM options based on Java version
# --enable-native-access=ALL-UNNAMED: Required by FFM (Foreign Function & Memory) API
#   for native system calls (file operations, process management).
# Perl call frames currently use the Java stack.  A 16 MiB stack lets ordinary
# Perl recursion reach ecosystem guard limits (Catalyst defaults to 1000 calls)
# before HotSpot raises StackOverflowError.  A later -Xss in JPERL_OPTS still
# overrides this default for callers with different constraints.
JVM_OPTS="-Xss16m --enable-native-access=ALL-UNNAMED"

# Note on JVM heap settings: do NOT set -XX:SoftMaxHeapSize below -Xmx.
# That combination triggers an aggressive G1 GC cadence that interacts
# pathologically with PerlOnJava's weak-ref / selective-refcount
# machinery — DBIx-Class t/96_is_deteministic_value.t hangs at 100% CPU
# under -XX:SoftMaxHeapSize=2g -Xmx4g while passing in seconds without
# the soft cap (or with SoftMax >= Xmx). The JVM's auto-default
# (MaxHeapSize = 1/4 of system RAM) is honored when nothing is set.
# Override via `JPERL_OPTS="-Xmx<size>"` in the environment if needed
# (e.g. memory-intensive tests like re/pat.t).

# Java 23+ warns about sun.misc.Unsafe usage (JEP 471). Add flag to suppress
# warnings from transitive libraries (ASM, ICU4J, etc.) that still use it.
JAVA_BIN="${PERLONJAVA_JAVA_BIN:-}"
if [ -z "$JAVA_BIN" ] && [ -n "${JAVA_HOME:-}" ] && [ -x "$JAVA_HOME/bin/java" ]; then
    JAVA_BIN="$JAVA_HOME/bin/java"
fi
if [ -z "$JAVA_BIN" ]; then
    JAVA_BIN="$(command -v java 2>/dev/null || true)"
fi
if [ -z "$JAVA_BIN" ] || [ ! -x "$JAVA_BIN" ]; then
    echo "ERROR: PerlOnJava requires Java 24 or later; java was not found in PATH." >&2
    exit 1
fi
export PERLONJAVA_JAVA_BIN="$JAVA_BIN"
JAVA_VERSION_OUTPUT="$("$JAVA_BIN" -version 2>&1)"
if [[ "$JAVA_VERSION_OUTPUT" =~ version\ \"([0-9]+) ]]; then
    JAVA_VERSION="${BASH_REMATCH[1]}"
else
    JAVA_VERSION=""
fi
if ! [[ "$JAVA_VERSION" =~ ^[0-9]+$ ]] || [ "$JAVA_VERSION" -lt 24 ]; then
    echo "ERROR: PerlOnJava requires Java 24 or later (found: ${JAVA_VERSION:-unknown})." >&2
    exit 1
fi
if [ "$JAVA_VERSION" -ge 23 ] 2>/dev/null; then
    JVM_OPTS="$JVM_OPTS --sun-misc-unsafe-memory-access=allow"
fi

# Note: Only include CLASSPATH if set, to avoid empty prefix that would add current dir to path
if [ -n "$CLASSPATH" ]; then
    CP="$CLASSPATH:$PERLONJAVA_CP"
else
    CP="$PERLONJAVA_CP"
fi
exec "$JAVA_BIN" $JVM_OPTS ${JPERL_OPTS} -cp "$CP" org.perlonjava.app.cli.Main "$@"