src/java.base/share/classes/jdk/internal/loader/BootLoader.java

@@ -37,10 +37,11 @@
 import java.security.AccessController;
 import java.security.PrivilegedAction;
 import java.util.Arrays;
 import java.util.Enumeration;
 import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.jar.JarInputStream;
 import java.util.jar.Manifest;
 import java.util.stream.Stream;
 
 import jdk.internal.misc.JavaLangAccess;

@@ -66,10 +67,14 @@
     }
 
     // ServiceCatalog for the boot class loader
     private static final ServicesCatalog SERVICES_CATALOG = new ServicesCatalog();
 
+    // ClassLoaderValue map for boot class loader
+    private static final ConcurrentHashMap<?, ?> CLASS_LOADER_VALUE_MAP =
+        new ConcurrentHashMap<>();
+
     /**
      * Returns the unnamed module for the boot loader.
      */
     public static Module getUnnamedModule() {
         return UNNAMED_MODULE;

@@ -81,10 +86,17 @@
     public static ServicesCatalog getServicesCatalog() {
         return SERVICES_CATALOG;
     }
 
     /**
+     * Returns the ClassLoaderValue map for the boot class loader.
+     */
+    public static ConcurrentHashMap<?, ?> getClassLoaderValueMap() {
+        return CLASS_LOADER_VALUE_MAP;
+    }
+
+    /**
      * Register a module with this class loader so that its classes (and
      * resources) become visible via this class loader.
      */
     public static void loadModule(ModuleReference mref) {
         ClassLoaders.bootLoader().loadModule(mref);