#!/usr/bin/env bash
# What does plain -XX:+UseShenandoahGC select on each JDK? Needs J25 and J28 pointing at JDKs that include Shenandoah
# (Temurin does; the Oracle builds from jdk.java.net do not).
set -u
for entry in "JDK 25:$J25" "JDK 28 EA:$J28"; do
  name=${entry%%:*}; home=${entry#*:}
  echo "== $name: $(env -u JAVA_TOOL_OPTIONS "$home/bin/java" -version 2>&1 | sed -n 3p)"
  echo "-- java -XX:+UseShenandoahGC -Xlog:gc+init -version"
  env -u JAVA_TOOL_OPTIONS "$home/bin/java" -XX:+UseShenandoahGC -Xlog:gc+init -Xmx256m -version 2>&1 | grep -E 'Mode:|warning|WARNING|deprecat' 
  echo "-- java -XX:+UseShenandoahGC -XX:+PrintFlagsFinal -version  (ShenandoahGCMode)"
  env -u JAVA_TOOL_OPTIONS "$home/bin/java" -XX:+UseShenandoahGC -XX:+PrintFlagsFinal -Xmx256m -version 2>&1 | grep -E 'ShenandoahGCMode'
  echo "-- java -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational -Xlog:gc+init -version"
  env -u JAVA_TOOL_OPTIONS "$home/bin/java" -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational -Xlog:gc+init -Xmx256m -version 2>&1 | grep -E 'Mode:|warning|WARNING|deprecat'
  echo "-- java -XX:+UseShenandoahGC -XX:ShenandoahGCMode=satb -Xlog:gc+init -version"
  env -u JAVA_TOOL_OPTIONS "$home/bin/java" -XX:+UseShenandoahGC -XX:ShenandoahGCMode=satb -Xlog:gc+init -Xmx256m -version 2>&1 | grep -E 'Mode:|warning|WARNING|deprecat'
  echo
done