view src/share/vm/oops/klassOop.hpp @ 45:48a3fa21394b

6667615: (Escape Analysis) extend MDO to cache arguments escape state Summary: Use MDO to cache arguments escape state determined by the byte code escape analyzer. Reviewed-by: never
author kvn
date Tue, 11 Mar 2008 19:00:38 -0700
children c18cbe5936b8
line wrap: on
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 * Copyright 1997-2002 Sun Microsystems, Inc.  All Rights Reserved.
 * 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.
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit if you need additional information or
 * have any questions.

// A klassOop is the C++ equivalent of a Java class.
// Part of a klassOopDesc is a Klass which handle the
// dispatching for the C++ method calls.

//  klassOop object layout:
//    [header     ]
//    [klass_field]
//    [KLASS      ]

class klassOopDesc : public oopDesc {
  // size operation
  static int header_size()                       { return sizeof(klassOopDesc)/HeapWordSize; }

  // support for code generation
  static int klass_part_offset_in_bytes()        { return sizeof(klassOopDesc); }

  // returns the Klass part containing dispatching behavior
  Klass* klass_part()                            { return (Klass*)((address)this + klass_part_offset_in_bytes()); }