src/hotspot/share/prims/jvm.cpp

*** 715,724 ****
--- 715,735 ----
  
  
  // Misc. class handling ///////////////////////////////////////////////////////////
  
  
+ JVM_ENTRY(void, JVM_LinkClass(JNIEnv* env, jclass classClass, jclass arg))
+   JVMWrapper("JVM_LinkClass");
+ 
+   oop r = JNIHandles::resolve(arg);
+   Klass* klass = java_lang_Class::as_Klass(r);
+ 
+   if (!ClassForNameDeferLinking && klass->is_instance_klass()) {
+     InstanceKlass::cast(klass)->link_class(CHECK);
+   }
+ JVM_END
+ 
  JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
    JVMWrapper("JVM_GetCallerClass");
  
    // Getting the class of the caller frame.
    //
*** 825,837 ****
      protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
    }
  
    Handle h_loader(THREAD, loader_oop);
    Handle h_prot(THREAD, protection_domain);
-   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
-                                                h_prot, false, THREAD);
  
    if (log_is_enabled(Debug, class, resolve) && result != NULL) {
      trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
    }
    return result;
  JVM_END
--- 836,849 ----
      protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
    }
  
    Handle h_loader(THREAD, loader_oop);
    Handle h_prot(THREAD, protection_domain);
  
+   jboolean link = !ClassForNameDeferLinking;
+   jclass result = find_class_from_class_loader(env, h_name, init, link, h_loader,
+                                                h_prot, false, THREAD);
    if (log_is_enabled(Debug, class, resolve) && result != NULL) {
      trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
    }
    return result;
  JVM_END
*** 864,874 ****
      class_loader = from_class->class_loader();
      protection_domain = from_class->protection_domain();
    }
    Handle h_loader(THREAD, class_loader);
    Handle h_prot  (THREAD, protection_domain);
!   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
                                                 h_prot, true, thread);
  
    if (log_is_enabled(Debug, class, resolve) && result != NULL) {
      // this function is generally only used for class loading during verification.
      ResourceMark rm;
--- 876,886 ----
      class_loader = from_class->class_loader();
      protection_domain = from_class->protection_domain();
    }
    Handle h_loader(THREAD, class_loader);
    Handle h_prot  (THREAD, protection_domain);
!   jclass result = find_class_from_class_loader(env, h_name, init, false, h_loader,
                                                 h_prot, true, thread);
  
    if (log_is_enabled(Debug, class, resolve) && result != NULL) {
      // this function is generally only used for class loading during verification.
      ResourceMark rm;
*** 3422,3445 ****
  }
  
  
  // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
  
! jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
                                      Handle loader, Handle protection_domain,
                                      jboolean throwError, TRAPS) {
    // Security Note:
    //   The Java level wrapper will perform the necessary security check allowing
    //   us to pass the NULL as the initiating class loader.  The VM is responsible for
    //   the checkPackageAccess relative to the initiating class loader via the
    //   protection_domain. The protection_domain is passed as NULL by the java code
    //   if there is no security manager in 3-arg Class.forName().
    Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
  
!   // Check if we should initialize the class
    if (init && klass->is_instance_klass()) {
      klass->initialize(CHECK_NULL);
    }
    return (jclass) JNIHandles::make_local(env, klass->java_mirror());
  }
  
  
--- 3434,3462 ----
  }
  
  
  // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
  
! jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, jboolean link,
                                      Handle loader, Handle protection_domain,
                                      jboolean throwError, TRAPS) {
+   // Initialization also implies linking - check for coherent args
+   assert((init && link) || !init, "incorrect use of init/link arguments");
+ 
    // Security Note:
    //   The Java level wrapper will perform the necessary security check allowing
    //   us to pass the NULL as the initiating class loader.  The VM is responsible for
    //   the checkPackageAccess relative to the initiating class loader via the
    //   protection_domain. The protection_domain is passed as NULL by the java code
    //   if there is no security manager in 3-arg Class.forName().
    Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
  
!   // Check if we should initialize the class (which implies linking), or just link it
    if (init && klass->is_instance_klass()) {
      klass->initialize(CHECK_NULL);
+   } else if (link && klass->is_instance_klass()) {
+     InstanceKlass::cast(klass)->link_class(CHECK_NULL);
    }
    return (jclass) JNIHandles::make_local(env, klass->java_mirror());
  }