src/share/classes/java/lang/reflect/AccessibleObject.java

rev 9948 : 6642881: Improve performance of Class.getClassLoader()
Summary: Add classLoader to java/lang/Class instance for fast access
Reviewed-by: alanb, lfoltan, rriggs, vlivanov, twisti, mchung, jfranck, dholmes

*** 1,7 ****
  /*
!  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 127,146 ****
          SecurityManager sm = System.getSecurityManager();
          if (sm != null) sm.checkPermission(ACCESS_PERMISSION);
          setAccessible0(this, flag);
      }
  
!     /* Check that you aren't exposing java.lang.Class.<init>. */
      private static void setAccessible0(AccessibleObject obj, boolean flag)
          throws SecurityException
      {
          if (obj instanceof Constructor && flag == true) {
              Constructor<?> c = (Constructor<?>)obj;
              if (c.getDeclaringClass() == Class.class) {
!                 throw new SecurityException("Can not make a java.lang.Class" +
                                              " constructor accessible");
              }
          }
          obj.override = flag;
      }
  
      /**
--- 127,154 ----
          SecurityManager sm = System.getSecurityManager();
          if (sm != null) sm.checkPermission(ACCESS_PERMISSION);
          setAccessible0(this, flag);
      }
  
!     /* Check that you aren't exposing java.lang.Class.<init> or sensitive
!        fields in java.lang.Class. */
      private static void setAccessible0(AccessibleObject obj, boolean flag)
          throws SecurityException
      {
          if (obj instanceof Constructor && flag == true) {
              Constructor<?> c = (Constructor<?>)obj;
              if (c.getDeclaringClass() == Class.class) {
!                 throw new SecurityException("Cannot make a java.lang.Class" +
                                              " constructor accessible");
              }
+         } else if (obj instanceof Field && flag == true) {
+             Field f = (Field)obj;
+             if (f.getDeclaringClass() == Class.class &&
+                 f.getName().equals("classLoader")) {
+                 throw new SecurityException("Cannot make java.lang.Class.classLoader" +
+                                             " accessible");
+             }
          }
          obj.override = flag;
      }
  
      /**