/*

 * Copyright (c) 1998, 2010, 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.

 *

 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP

#define SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP

#include "oops/oop.hpp"

// A compiledICHolderOop is a helper object for the inline cache implementation.

// It holds an intermediate value (method+klass pair) used when converting from

// compiled to an interpreted call.

//

// compiledICHolderOops are always allocated permanent (to avoid traversing the

// codeCache during scavenge).

class compiledICHolderOopDesc : public oopDesc {

  friend class VMStructs;

 private:

  methodOop _holder_method;

  klassOop  _holder_klass;    // to avoid name conflict with oopDesc::_klass

 public:

  // accessors

  methodOop holder_method() const     { return _holder_method; }

  klassOop  holder_klass()  const     { return _holder_klass; }

  void set_holder_method(methodOop m) { oop_store_without_check((oop*)&_holder_method, (oop)m); }

  void set_holder_klass(klassOop k)   { oop_store_without_check((oop*)&_holder_klass, (oop)k); }

  static int header_size()            { return sizeof(compiledICHolderOopDesc)/HeapWordSize; }

  static int object_size()            { return align_object_size(header_size()); }

  // interpreter support (offsets in bytes)

  static int holder_method_offset()   { return offset_of(compiledICHolderOopDesc, _holder_method); }

  static int holder_klass_offset()    { return offset_of(compiledICHolderOopDesc, _holder_klass); }

  // GC support

  oop* adr_holder_method() const      { return (oop*)&_holder_method; }

  oop* adr_holder_klass() const       { return (oop*)&_holder_klass; }

};

#endif // SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP