[OPENJDK-4106] Compact object headers for JDK25

In the JRE module only (so far); define jvm_specific_options
containing -XX:+UseCompactObjectHeaders unless
JAVA_COMPACT_OBJECT_HEADERS is defined to "false".

Signed-off-by: Jonathan Dowland <[email protected]>

Author: jmtd

modules/jre/25/artifacts/opt/jboss/container/openjdk/jre/jvm-options

@@ -0,0 +1,9 @@
+#!/bin/bash
+# this is a script library and is intended to be sourced, not executed.
+
+# OPENJDK-4106
+jvm_specific_options() {
+  if [ "$JAVA_COMPACT_OBJECT_HEADERS" != "false" ]; then
+    echo "-XX:+UseCompactObjectHeaders"
+  fi
+}

modules/jre/25/configure.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+set -euo pipefail
+
+SCRIPT_DIR=$(dirname $0)
+ARTIFACTS_DIR=${SCRIPT_DIR}/artifacts
+
+install -m 0644 -D {${ARTIFACTS_DIR},}${JBOSS_CONTAINER_OPENJDK_JRE_MODULE}/jvm-options

modules/jre/25/module.yaml

@@ -21,6 +21,9 @@ envs:
   value: *jdkver
 - name: JBOSS_CONTAINER_OPENJDK_JRE_MODULE
   value: /opt/jboss/container/openjdk/jre
+- name:         JAVA_COMPACT_OBJECT_HEADERS
+  description:  Whether to enable compact object headers (JEP519) for JDK24 and newer. Enabled by default.
+  example:      "false"
 
 packages:
   install:
@@ -30,3 +33,6 @@ modules:
   install:
   - name: jboss.container.user
   - name: jboss.container.openjdk
+
+execute:
+- script: configure.sh