src/share/classes/java/lang/Class.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) 1994, 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) 1994, 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
*** 128,142 ****
      static {
          registerNatives();
      }
  
      /*
!      * Constructor. Only the Java Virtual Machine creates Class
!      * objects.
!      */
!     private Class() {}
! 
  
      /**
       * Converts the object to a string. The string representation is the
       * string "class" or "interface", followed by a space, and then by the
       * fully qualified name of the class in the format returned by
--- 128,146 ----
      static {
          registerNatives();
      }
  
      /*
!      * Private constructor. Only the Java Virtual Machine creates Class objects.
!      * This constructor is not used and prevents the default constructor being
!      * generated.
!      */
!     private Class(ClassLoader loader) {
!         // Initialize final field for classLoader.  The initialization value of non-null
!         // prevents future JIT optimizations from assuming this final field is null.
!         classLoader = loader;
!     }
  
      /**
       * Converts the object to a string. The string representation is the
       * string "class" or "interface", followed by a space, and then by the
       * fully qualified name of the class in the format returned by
*** 675,686 ****
          }
          return cl;
      }
  
      // Package-private to allow ClassLoader access
!     native ClassLoader getClassLoader0();
  
  
      /**
       * Returns an array of {@code TypeVariable} objects that represent the
       * type variables declared by the generic declaration represented by this
       * {@code GenericDeclaration} object, in declaration order.  Returns an
--- 679,692 ----
          }
          return cl;
      }
  
      // Package-private to allow ClassLoader access
!     ClassLoader getClassLoader0() { return classLoader; }
  
+     // Initialized in JVM not by private constructor
+     private final ClassLoader classLoader;
  
      /**
       * Returns an array of {@code TypeVariable} objects that represent the
       * type variables declared by the generic declaration represented by this
       * {@code GenericDeclaration} object, in declaration order.  Returns an