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

*** 37,46 ****
--- 37,47 ----
  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;
*** 66,75 ****
--- 67,80 ----
      }
  
      // 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;
*** 81,90 ****
--- 86,102 ----
      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);