/*

 * Copyright (c) 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.

 *

 * 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_OPTO_NARROWPTRNODE_HPP

#define SHARE_VM_OPTO_NARROWPTRNODE_HPP

#include "opto/node.hpp"

#include "opto/opcodes.hpp"

//------------------------------EncodeNarrowPtr--------------------------------

class EncodeNarrowPtrNode : public TypeNode {

  protected:

  EncodeNarrowPtrNode(Node* value, const Type* type):

  TypeNode(type, 2) {

    init_class_id(Class_EncodeNarrowPtr);

    init_req(0, NULL);

    init_req(1, value);

  }

  public:

  virtual uint  ideal_reg() const { return Op_RegN; }

  virtual Node *Ideal_DU_postCCP( PhaseCCP *ccp );

};

//------------------------------EncodeP--------------------------------

// Encodes an oop pointers into its compressed form

// Takes an extra argument which is the real heap base as a long which

// may be useful for code generation in the backend.

class EncodePNode : public EncodeNarrowPtrNode {

  public:

  EncodePNode(Node* value, const Type* type):

  EncodeNarrowPtrNode(value, type) {

    init_class_id(Class_EncodeP);

  }

  virtual int Opcode() const;

  virtual Node *Identity( PhaseTransform *phase );

  virtual const Type *Value( PhaseTransform *phase ) const;

};

//------------------------------EncodePKlass--------------------------------

// Encodes a klass pointer into its compressed form

// Takes an extra argument which is the real heap base as a long which

// may be useful for code generation in the backend.

class EncodePKlassNode : public EncodeNarrowPtrNode {

  public:

  EncodePKlassNode(Node* value, const Type* type):

  EncodeNarrowPtrNode(value, type) {

    init_class_id(Class_EncodePKlass);

  }

  virtual int Opcode() const;

  virtual Node *Identity( PhaseTransform *phase );

  virtual const Type *Value( PhaseTransform *phase ) const;

};

//------------------------------DecodeNarrowPtr--------------------------------

class DecodeNarrowPtrNode : public TypeNode {

  protected:

  DecodeNarrowPtrNode(Node* value, const Type* type):

  TypeNode(type, 2) {

    init_class_id(Class_DecodeNarrowPtr);

    init_req(0, NULL);

    init_req(1, value);

  }

  public:

  virtual uint  ideal_reg() const { return Op_RegP; }

};

//------------------------------DecodeN--------------------------------

// Converts a narrow oop into a real oop ptr.

// Takes an extra argument which is the real heap base as a long which

// may be useful for code generation in the backend.

class DecodeNNode : public DecodeNarrowPtrNode {

  public:

  DecodeNNode(Node* value, const Type* type):

  DecodeNarrowPtrNode(value, type) {

    init_class_id(Class_DecodeN);

  }

  virtual int Opcode() const;

  virtual const Type *Value( PhaseTransform *phase ) const;

  virtual Node *Identity( PhaseTransform *phase );

};

//------------------------------DecodeNKlass--------------------------------

// Converts a narrow klass pointer into a real klass ptr.

// Takes an extra argument which is the real heap base as a long which

// may be useful for code generation in the backend.

class DecodeNKlassNode : public DecodeNarrowPtrNode {

  public:

  DecodeNKlassNode(Node* value, const Type* type):

  DecodeNarrowPtrNode(value, type) {

    init_class_id(Class_DecodeNKlass);

  }

  virtual int Opcode() const;

  virtual const Type *Value( PhaseTransform *phase ) const;

  virtual Node *Identity( PhaseTransform *phase );

};

#endif // SHARE_VM_OPTO_NARROWPTRNODE_HPP